“You think the rules don’t apply to you”: 30-year-old serial cheater gets cheated on after marriage, her younger sister has no sympathy, causing sisterly showdown

Author image for Briana Viser
Briana Viser • Writer and Editor
Apr 19, 2025 3:00 PM EDT

Hey there everyone. Cheating is wildly common, but that doesn't mean it's normal. There's never an excuse for cheating. People can make excuses, like the person was young and immature, or that they were tempted. There's a million excuses in the book, but at the end of the day it's not an act that deserves an excuse or explanation. It's despicable and anyone who does it knows exactly what they're getting into, it was never an accident. I believe there's even a level of premeditation in some form before they do it, there's no way that the feeling just came on so suddenly in a moment and then they did the ultimate sealing the deal to end their current relationship, destroy someone's heart, all for a few moments of something. 

In the story below, it centers around two sisters. The older one has a long history with infidelity, and in ways that have negatively affected her younger sister. She even stole a guy from her when they were in college. There's nothing redeemable about her actions, and I can understand that the younger sister would be upset. Fast forward and the older, cheating sister has married who she thinks is the love of her life, until she realizes that her husband has been cheating on her. Read the full story below for all the juicy details.

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  • 01

    AITA for telling my sister she deserved to get cheated on?

    "You deserve this"
    via Zeinab Ghassemi from Pexels / Canva

    This image is for illustration only, and the subjects are models; the image does not depict the actual subjects of the story.

  • 02
    So, I (28F) have always had a rocky relationship with my sister (30F). She's always been the golden child. The one who got praised for everything, even when she messed up. Meanwhile, I was constantly compared to her and never quite measured up in my parents' eyes.
    via u/Pristine_Wasabi2994
  • 03
    Growing up, she was always in relationships—constantly jumping from one guy to the next. And she cheated in almost every single one of them. She even went behind my back in college and hooked up with a guy I was seeing at the time. She said it was
    via u/Pristine_Wasabi2994
  • 04
    "just a fling" and that I was being dramatic for caring. That was the final straw in our relationship, and while we've been civil since then, we've never really been close.
    via u/Pristine_Wasabi2994
  • 05
    Fast forward to last year, she got married to this guy-let's call him Ryan. Ryan was charming, successful, and looked like someone who walked out of a fitness magazine. My family loved him, and of course, she flaunted him like a trophy.
    via u/Pristine_Wasabi2994
  • 06
    Last month, she found out Ryan had been cheating on her-with multiple women. She was devastated, crying her eyes out, and came to our parents' house where I happened to be visiting. She was sobbing, saying she didn't know what she did to deserve this.
    via u/Pristine_Wasabi2994
  • 07
    I stayed quiet at first, but then she turned to me and said, "You've been quiet. Don't you have anything to say?"
    via u/Pristine_Wasabi2994
  • 08
    Cheezburger Image 10495130880
    via NeonShot from Getty Images Pro / Canva

    This image is for illustration only, and the subjects are models; the image does not depict the actual subjects of the story.

  • 09
    So I said, "You had this coming. You've cheated on every guy you've ever dated. You stole one from me. You think the rules don't apply to you. Maybe now you understand how it feels."
    via u/Pristine_Wasabi2994
  • 10
    She burst into tears again, and my mom immediately told me I was being cruel. My dad said I should apologize. But I didn't.
    via u/Pristine_Wasabi2994
  • 11
    Now my whole family is acting like I kicked her while she was down. I don't feel bad for what I said. I think she needed to hear it. So... AITA?
    via u/Pristine_Wasabi2994
  • 12
    Turbulent Ebb5669 • 23h ago I'll take And that happened for 10
    via u/Turbulent Ebb5669
  • 13
    TheFairyQueen420 • 14h ago NTA. It's called karma & it came to bite your sister in the a. Sorry, but you can't expect to go around being doing to everybody and things and
    via u/TheFairyQueen420
  • 14
    expect nothing bad to happen to you. Your sister FA & FO. I'd have 0 sympathy for her either.
    via u/TheFairyQueen420
  • 15
    moffabertel • 23h ago You're definitely NTA, needed to hear that. Hopefully she can accept all that she has done wrong in the past and live a moral life onwards. You definitely deserve an apology for what
    via u/moffabertel
  • 16
    Cheezburger Image 10495132672
    via Konstantin Postumitenko from Prostock-studio / Canva

    This image is for illustration only, and the subjects are models; the image does not depict the actual subjects of the story.

  • 17
    she has done to you, but you never have to forgive her. Hopefully she can become a better person for her own. and for the world's sake
    via u/moffabertel
  • 18
    Zanke95 23h ago . Nta she finally got a taste of her own medicine seems like she did not enjoy it. I would not apologize either
    via u/Zanke95
  • 19
    Select_Insect_4450 • 6h ago NTAH, what goes around comes around. Payback (partially for all the guys and you that her being hurt. has
    via u/Select_Insect_4450
  • 20
    downvoteiscool • 5h ago Telll you're sister it's called. karma
    via u/downvoteiscool
  • 21
    Madam_J100 • 23h ago NTA. I have no sympathy for cheaters. She cheated in several of her relationships and even went after a guy you were seeing in college. There's no telling who else's boyfriend she cheated with that you don't know about.
    via u/Madam_J100
  • 22
    Karma was just served to her on a silver platter and now she gets to see how it feels to be cheated on.
    via u/Madam_J100
  • 23
    • Bearlythegrizzlyb... 23h ago NTA. At first, it looks like you were going to say nothing. She came to you and ask for it. What did she expected after cheating on every ex she had and with one of your ex? I'm glad you
    via u/Bearlythegrizzlybear
  • 24
    stayed true to yourself and did not lied because of so called peace.
    via u/Bearlythegrizzlybear
  • 25
    Your parents are in denial. Don't apologize. You said nothing that was not true.
    via u/Bearlythegrizzlybear
  • 26
    bwcsd89 • 21h ago NTA. I'll always remember when one of my best buddies stole a girl I was getting close with in high school and while I forgave him I'll always still be bitter about it and call him an a__h_le haha
    via u/bwcsd89

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