Man Exposes Cheating Sister-In-Law to Her Husband, Wife Takes Sister’s Side and Accuses Him of Ruining Sister’s Happiness, She Considers Divorce

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Briana Viser • Writer and Editor
Dec 21, 2024 3:00 PM EST

Welcome back ladies and gentlemen of the internet. Infidelity is one of the most heartbreaking and painful things someone can experience. No one wants to be cheated on, and its consequences are universal. Everyone is left feeling demeaned, disrespected, and even dumbfounded as to how they could have been dating or married to someone they actually barely knew. As ubiquitously painful as it is, it's still incredibly common. How could something this horrific and destructive simultaneously be so common? 

In this Reddit thread, it's about a woman's infidelity. The original poster (OP) is a man who finds out his SIL is cheating on her husband. Not that he's particularly close with his BIL, he feels empathetic and protective of him in the situation. His wife seems to accept and support her sister through the affair, until OP decides he's seen enough. He rats out his SIL, only to be labeled the bad guy. 

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  • 01
    My wife hasn't been the same with me since she found out I was the one who told M. Her sister is polluting her head. I can't be trusted apparently. Idk was i in the wronf should i have swallowed the guilt of knowing and moved on? If i was in M's place i would hate if someone knew and didnt tell me
    via Canva
  • 02
    r/AITAH ⚫9 hr. ago gorizzardly My Wife's Sister is Cheating, and Now I'm the Bad Guy
    via u/gorizzardly
  • 03
    My wife's sister '30F' (let's call her B) is cheating on her husband '32M' (M). B and M have a child together, but their relationship isn't great. And for context, I'm not particularly close to M.
    via u/gorizzardly
  • 04
    This all started when B began FaceTiming my wife (they live in different countries), telling her about this guy she's been dating. When I first overheard this, it made me sick. From September until last month, B would call every other day to share "the tea" with my wife-what they did, their
    via u/gorizzardly
  • 05
    secret rendezvous, and even intimate details about their relationship. To make matters worse, this guy is married with three kids.
    via u/gorizzardly
  • 06
    When my wife visited B, she told her to stop doing what shes doing!!!!. After that, B stopped confiding in her.
    via u/gorizzardly
  • 07
    Fast forward a few weeks ago: M called my wife, asking if she had heard from B because she had gone away for a weekend "girls- only" engagement party. She hadn't picked up her phone for a day, and B had told M that the bride was one of my wife's friends. My wife covered for B while on the
    via u/gorizzardly
  • 08
    phone, but I knew the truth—that B was in a hotel room with her affair partner while M was at home taking care of their kid.
    via u/gorizzardly
  • 09
    At that point, I couldn't take it anymore. I created an anonymous WhatsApp account and messaged M, giving him the basic details of what was going on. Long story short, M found out everything. However after being enraged for a day, instead of addressing B's behavior, she somehow manipulated M, and now they're
    via u/gorizzardly
  • 10
    both coming after me. They've accused me of being mentally. unstable, a drama-causer, and a horrible person. They've even told my wife to "watch out for me" and that she can never see B's child (whom she adores).
    via u/gorizzardly
  • 11
    To make matters worse, even their mother has sided with B, saying shes disgusted with me and that my wife should leave me.
    via u/gorizzardly
  • 12
    My wife hasn't been the same with me since she found out I was the one who told M. Her sister is polluting her head. I can't be trusted apparently. Idk was i in the wronf should i have swallowed the guilt of knowing and moved on? If i was in M's place i would hate if someone knew and didnt tell me
    via u/gorizzardly
  • 13
    FYI ( I kept telling my wife and her father to speak to M) they did nothing and B kept cheating.
    via u/gorizzardly
  • 14
    Edit: They found out it was me. because of the level of detail that i provided. B + M quickly realised it was me because apparently only my wife would know such details, and also the fact that i use British English and they are American... mistakes were made ☑
    via u/gorizzardly
  • 15
    notAugustbutor... 8h ago • Your wife approved of and covered for someone who was cheating on her husband. That says a lot about her own moral character. Ask her why she believes it is ok for her sister to have an affair. If she gives
    via u/notAugustbutor
  • 16
    you any reasons in answer then those are the reasons she feels justify being unfaithful to you. You can no longer trust her family and she has to go a long way to show you can trust her.
    via u/notAugustbutor
  • 17
    Character-Tell4893 8h ago • Top 1% Commenter If your wife is that ok with it than i would be worried that she has also cheated. Sorry you married a woman and into a family with such low character. ΝΤΑ
    via u/Character-Tell4893
  • 18
    Wei_Ku 8h ago • NTA. You did what you thought was right by telling M, and honestly, I'd want to know if I were in his shoes too. B's behavior is toxic, and the fact that she's cheating with a married man makes it even worse, it's affecting two
    via u/Wei_Ku
  • 19
    families, not just hers. Your wife and her family siding with B is a classic case of "shooting the messenger." It's easier for them to defame you than to deal with the truth about B's actions. It's especially disappointing that your wife hasn't supported you, especially since you
    via u/Wei_Ku
  • 20
    urged her to address this first. You're not wrong for struggling to sit silently while someone's life gets destroyed by lies. Sure, anonymity can muddy things, but the core issue is B's cheating, not how M found out. Stay true to your values, and if your wife's trust in you
    via u/Wei_Ku
  • 21
    is shaken, maybe it's time for a deeper conversation about honesty and accountability in your relationship. You don't deserve to be the scapegoat for someone else's mess.
    via u/Wei_Ku
  • 22
    Ifiwerenyourshoes • 8h ago • NTA, and if it were me, I would tell my wife you can go ahead and divorce me over this. As I wondering who I married. If it is this easy for you to cover for your sister and take her side, why would you not do it to me. So let's
    via u/Ifiwerenyourshoes
  • 23
    get a divorce your morals are not where mine are.
    via u/Ifiwerenyourshoes
  • 24
    Much-Tie-4057 • 8h ago • Find a door and leave NTA
    via u/Much-Tie-4057
  • 25
    Basic Rabbit4 ⚫8h ago • I'm so confused. M confirmed that his wife was cheating and he's mad at you bc you told him the truth? Why?
    via u/Basic Rabbit4
  • 26
    KhaosSlash 8h ago • NTA. Let your wife, sil and all parties live in their delusional world.
    via u/KhaosSlash
  • 27
    Mbt Omega •8h ago. Top 1% Commenter NTA, but your wife's pro- cheating, so she's probably a cheater. Get tested for STDs, DNA test the kids if you have them, and dump her shady a.
    via u/Mbt Omega

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