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Woman Finds Out Her Sister Betrayed Her For Her Cheating Ex, So She Hits Back Where It Hurts Most: The Wallet

by Annie Nguyen
October 12, 2025
in Social Issues

Trust is fragile, and once broken, it’s hard to rebuild. This woman’s marriage ended in heartbreak after her husband left her for another woman, shattering years of love and loyalty. Slowly, she found her footing again, believing that the people who remained in her life were her true support system.

That illusion crumbled when she discovered her own sister’s secret connection to the couple who caused her pain. Betrayal from family cuts differently; it feels colder, sharper. Now she’s facing a moral dilemma: does pulling the financial plug make her vindictive, or simply someone who’s finally setting boundaries?

A woman faced her second betrayal, this time not from her ex, but from her sister

Woman Finds Out Her Sister Betrayed Her For Her Cheating Ex, So She Hits Back Where It Hurts Most: The Wallet
not the actual photo

'AITA for financially screwing over my sister after finding out she’s close with my ex and his wife?'

Usually, I wouldn’t take personal advice from strangers online, but everyone in my life seems to think I’m a petty, scorned, bitter woman (which I probably am), and I need...

My ex-husband (currently 43M) and I (43F) were college sweethearts. For me, life felt perfect. I trusted him completely.

That’s why it was so shocking when I found out he was in love with his much younger colleague. She was around 24 at the time.

I won’t get into the details of how I found out, but the affair was well-known at his workplace. When I confronted him, all he said was, “I’m sorry. I...

He didn’t seem sorry at all. It felt like he wanted me to leave him. So I did. That was six years ago.

Our son was four then, and it was the worst time of my life. I honestly don’t know how I got through it.

And because I was desperate, I wanted him to fight for me, to fight for our family. But he didn’t. He was quick to sign the divorce papers and didn’t...

It was as if he had started a new life and completely erased the old one. It took years of therapy to feel normal again, to stop checking that woman’s...

The fact that she’s very pretty and charming didn’t help. His family loved her. And as disgusting as it sounds, one of our common friends even said it out loud,

‘I don’t support cheating but I mean, look at her’, when I told her about the cheating.

I guess that’s what everyone was thinking, this one was just stupid enough to voice it out. So I had to cut off that group of friends too.

They got married three years ago and now have a daughter. A picture-perfect little family.

The current arrangement is that our son stays with my ex on weekends and holidays, which works fine for the most part.

Last week, I found out my sister (28f) has been in touch with my ex all these years. That would’ve been forgivable, since they were close when we were married...

But she’s actually best friends with his new wife. And she kept it from me for six years.

I only found out because she left her phone at my house, and I saw several texts from the wife. When I asked her about it, she just brushed it...

I told her she can do what she wants, but I will be cutting her off completely (I was helping her pay her college loans lol). and going no contact.

She called me unreasonable and said I’m being petty and unable to move on from something that happened a long time ago.

She also said the wife is a lovely person and a good friend. She said she will be fucked, financially speaking. I told her to go f__k herself. Somehow, my...

 

Family betrayal often cuts deeper than romantic heartbreak because it violates both emotional and moral trust.

According to Dr. Ramani Durvasula, a clinical psychologist known for her work on toxic relationships, betrayal from loved ones “rewires our sense of safety.” When someone you trust minimizes your trauma, it creates a form of secondary betrayal, one that forces you to relive the pain you’ve already survived.

In this story, the sister’s ongoing friendship with the ex and his new wife signals not just indifference but complicity.

As Dr. Harriet Lerner, author of The Dance of Anger, explains, “People who betray others often justify their behavior by framing themselves as peacemakers. But neutrality in the face of cruelty is never neutral; it’s support for the aggressor.”

What makes this dynamic more painful is the manipulation disguised as “family unity.” Research by the Journal of Family Psychology (2021) found that 67% of estranged adults reported being labeled “dramatic” or “selfish” when setting boundaries. In reality, those boundaries are crucial for emotional survival.

The woman’s financial withdrawal wasn’t punishment; it was a correction. Her sister knowingly accepted financial help while maintaining loyalty to the very people who destroyed her sibling’s marriage. That’s not kindness, it’s exploitation.

Forgiveness, as therapist Dr. Nedra Glover Tawwab often writes, doesn’t mean “access.” You can wish someone peace while keeping them out of your wallet and your life. Until genuine accountability is shown, like a sincere apology or visible remorse, reconnection only reopens wounds.

If anything, this story reminds us that healing sometimes looks harsh from the outside. But as Dr. Lerner puts it, “Boundaries are not walls; they are doors with locks you control.” And in this woman’s case, those doors are finally closing on the people who walked over her for years.

These are the responses from Reddit users:

Commenters applauded the OP for cutting her off, calling it “financial justice”

Fire_or_water_kai − So your sister only cared to have you pay her loans. That's why she kept it a secret,

and that's why you shouldn't feel bad cutting her off. She needs to ask your lovely ex and his wife to foot the bill from here on out. NTA

PrincessBella1 − NTA. Your sister has the right to be friends with whom she chooses to and you have the right to do with your money as you wish.

Take the money you have been contributing to her and put it in your son's college fund. Let your ex, his wife, and your parents pay for her school loans.

Wadewilson101 − NTA, anyone who sides with a cheater is probably a cheater themself. Maybe your sister can ask your ex and his wife to help instead seeing as how...

Some Redditors didn’t hold back, saying the sister “chose her side” and now could “ask her new bestie” to pay her loans

Additional_Pickle745 − Oh I’m utterly outraged for you! ! The absolute nerve of your sister. No more money for her, if she’s so bothered she should ask her new bestie....

NolaLove1616 − She only kept the relationship secret to continue milking you for cash. She “cheated” on you no differently than your ex did.

(Well differently but a betrayal of loyalty and trust.) I’d cut her CLEAN and tell your family to put THEIR money where their mouths are and support her!

My guess your “family” has known all along and helped hide the relationship. Or your ex and his new wife can cowboy up her tuition since they are all so...

Meanwhile, this group offered empathy, noting that healing from infidelity takes years and that betrayal from a sibling cuts even deeper

forgetregret1day − Wow. I know from personal experience that divorce involving another person is horrible to manage at best,

because your own self worth becomes damaged and you doubt everything about the whole relationship.

If he is capable of being with 2 women at the same time and acts like it was something that just happened to him rather than something he chose, what...

The spiral down is deep and painful and takes a lot of time to sort out. I feel for you OP.

But if it wasn’t bad enough, your own sister is doing the exact same thing. Using you for what she can get out of you while simultaneously bring besties

with the woman who decided she didn’t care that she was destroying your marriage and hurting your child as long as she got what she wanted. Your sister f**ked herself.

She made a choice and these are the consequences. I’m astonished that she has the nerve to act like the victim when she stomped on your feelings,

chose the other woman over you yet expected your continued financial support. Hell no. Let the adulterers pay her bills. She chose them over your feelings and they can have...

And don’t get me started on “it happened a long time ago”. That kind of betrayal has no expiration date. NTA.

Personal-Y − She hid it because she knew you'd have a problem with it. She didn't care how much it hurt you,

so she shouldn't be cashing in on the benefits of having you as her sister. FAFO. Her besties can help. Im so sorry your family sucks.

Nobody gets to dictate how you heal, how long it takes or the continued trauma that happens when people justify and excuse the s__tty behavior. I bet she'd be singing...

YouSayWotNow − NTA for deciding not to help pay her college loans. I find it weird that this is even a thing that's expected of siblings anyway.

Your parents chose to have their kids, it should be on them to help their kids financially. And even if they can't, it shouldn't be on one kid to help...

If your sister can't see why staying close friends with the man who cheated on you and hurt you so badly is a s__tty thing to do,

why on earth would she expect you to continue to help her financially???

Senator_Bink − NTA. Let "Like a Brother" and "New Best Friend" fund her college. I'm sure they'd love to, right?

I suspect you're going to get the last laugh once New Wife ages out of that marriage. Best of luck to you.

As one folk summed it up

Embarrassed_Loss_584 − NTA. Sooner or later one of those perfect people will cheat again and you can eat some popcorn while all their friends take sides.

Sometimes cutting someone off isn’t an act of revenge; it’s an act of survival. This woman didn’t just lose a husband; she lost the illusion that her family had her back. And when her sister proved she didn’t, she chose herself instead.

Do you think she overreacted, or was this the only fair consequence after years of hidden betrayal? Should forgiveness have a deadline or should some doors stay permanently closed? Let’s hear your take on this family feud that left the internet divided.

Annie Nguyen

Annie Nguyen

Hi, I'm Annie Nguyen. I'm a freelance writer and editor for Daily Highlight with experience across lifestyle, wellness, and personal growth publications. Living in San Francisco gives me endless inspiration, from cozy coffee shop corners to weekend hikes along the coast. Thanks for reading!

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