Woman cancels wedding after fiancé cheated with her best friend and tried to cover it up with a proposal, but his own sister couldn’t keep the secret any longer: 'She said it wasn't fair to me'

Author image for Isabella Penn
Isabella Penn
Apr 27, 2025 1:00 PM EDT

There's messy, and then there's this level of betrayal. In the age of public proposals and viral engagements, it's easy to get swept up in the romance of it all. But committing to a lifelong marriage with another person is a whole other story. And when your gut tells you something isn't right, you should always listen to it. For one woman, everything seemed perfect until her fiancé popped the question and suddenly everyone around her started acting weird. His mom was unusually quiet when she heard the news, his sister couldn't make eye contact, and even her best friend (who should've been thrilled) was quick to change the subject. Something was definitely up.

Thankfully, his sister couldn't live with the guilt and ended up spilling the tea during an appointment. An appointment with a wedding coordinator, we should add. Better late than never, I guess. Were they all seriously going to let her go through with it? 

Advertisement
  • Cheezburger Image 10497895424
    via Kelly Sikkema For Unsplash+

  • "AITA for cancelling my wedding out of the blue for a rumor about my fiancée and my best friend?"

    Me (F26) and my fiancée (M27) have been in a relationship for 4 years, and engaged for 1. I've always felt like our relationship was solid and stable, since we rarely got into fights, and even those would be light discussions. He's the
    via Bouch4Marie
  • sweetest, most supportive partner I've had, and truthfully I've been imagining our wedding for some months now. Everything came down once he told my mother in law that he proposed to me. I was in the same
    via Bouch4Marie
  • room, and I could see how her face fell. She pulled him into another room and I couldn't hear what they said, but I saw my fiancée's face as if he had been screamed at. My MIL soon after apologized and excused.
    via Bouch4Marie
  • herself out of our apartment, after I asked him what happened he didn't really answered me, just said that it was "mom and son stuff”. I didn't pressure on it, but it left a very bad taste in my mouth.
    via Bouch4Marie

    Not quite the reaction you want from your future MIL. 

    I'm not sure which is worse, this MIL, or this one: Boyfriend's mom calls his girlfriend a temporary addition to the family during birthday toast, so she pays her own bill and leaves for good: 'She looked directly at me and smiled'

  • Normally, I told my best friend (F26) about what happened, and she immediately changed the topic. Not really acknowledging how weird. it was or how I felt at his excuse. I didn't really get to ask why she was acting this way, since she always
    via Bouch4Marie
  • dismissed it or told me it wasn't that serious and I should be focused on the wedding. Days after, I met with my wedding coordinator to choose the overall aesthetic I wanted. My fiancée didn't come with
    via Bouch4Marie

    Days after? Girl, maybe you should take a step back for a minute and listen to the red flags. 

  • me since he was working, so my sister in law agreed to help me out. I saw this as an opportunity to make connection with his family. SIL was acting weird, almost uncomfortable by the planning. I thought it was
    via Bouch4Marie
  • normal, and she was probably overwhelmed by the planning. As I was looking for ideas, my SIL pulls me to the side and says that "she can't hold this secret any longer, because it wasn't fair for me". She told me
    via Bouch4Marie
  • that her brother and my best friend had been seeing each other behind my back, and my MIL found out about this, but told her he would soon break up with me. I was gobsmacked, I asked if she was sure of this and she said it's what she's
    via Bouch4Marie
  • heard, so not 100% sure. I confronted him about this, and he only responded with getting mad at his sister and me for believing "gossip". I tried to understand, but as the days went on I couldn't handle the
    via Bouch4Marie
  • Cheezburger Image 10497895168
    via Gabriel Ponton For Unsplash+

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

  • nerves and I left to my cousins' apartment. This morning, I sent out an email and messages to all my family members, saying that the wedding was cancelled. I really want to confront my best friend, but I know she will deny everything. With the
    via Bouch4Marie
  • wedding being so close, I couldn't handle the anxiety I felt. He has been exploding my phone with messages since I left, and I don't know what to do.
    via Bouch4Marie
  • yupyupyupitsducky2 NTA. You trusted your instincts and prioritized your mental health and emotional well- being, which is incredibly valid ―especially with something as
    via yupyupyupitsducky2
  • huge as a wedding. The whole situation sounds suspicious, from your MIL's reaction to your best friend dodging the topic, and even your fiancé's refusal to communicate clearly.
    via yupyupyupitsducky2
  • You weren't just reacting to a rumor- you were reacting to a pattern of odd, dismissive behavior and secrecy. When people are vague or deflective in situations
    via yupyupyupitsducky2
  • where honesty and transparency are crucial, that's a big red flag. You were right to pause and reassess instead of pushing forward into a lifelong commitment with all
    via yupyupyupitsducky2
  • these unresolved questions. Even if the rumor isn't 100% confirmed, the people closest to you didn't give you the clarity or reassurance you needed. That speaks volumes. You
    via yupyupyupitsducky2
  • deserve answers― and peace of mind— before making such a major life decision. Take your time. Let things settle. When you're ready, have
    via yupyupyupitsducky2
  • that confrontation with your best friend, but only on your own terms. Don't let anyone rush you.
    via yupyupyupitsducky2
  • LeoLupumFerocem It does seem sus. In all those months was there anything else that seemed off? I do not like that your friend did.
    via LeoLupumFerocem
  • not want to listen to you about the mil either. That is the most weird thing to me. I mean it is fresh gossip about a huge event. If my friend said that happened I would want the play by play.
    via LeoLupumFerocem
  • Is she usually against talking about things like this. And nta. You did not feel right and marriage is huge. Have you considered asking mil?
    via LeoLupumFerocem
  • No_Role2325 NTA. That's a pretty brave thing that you did. Always trust your gut.
    via No_Role2325
  • 69SirenBeauty NTA you trusted your gut when something felt deeply wrong, and honestly, that's brave.
    via 69SirenBeauty
  • Even if it was just a rumor, the weird behavior from both your fiancée and best friend (plus the MIL situation) gave you enough reason to pause. It's better to step back now than to ignore red flags and end. up hurt even worse later.
    via 69SirenBeauty

Tags

friendship bride rumors best friends revenge friends relationships wedding entitled people karma cheating couples entitled breakup fiancé gossip
Scroll Down For The Next Article