AITA for exposing my friend’s secret that ruined her engagement?

I (26F) have a best friend named Jessica (28F), and we’ve been inseparable since childhood. We’ve shared everything—our dreams, fears, and even the worst of our mistakes. Jessica was always the more outgoing one, while I was a bit more reserved. But we complemented each other well, and I always thought we’d have each other’s backs no matter what.

A few months ago, Jessica got engaged to her long-time boyfriend, Adam (30M). From the outside, everything looked perfect. Adam was kind, successful, and had been nothing but supportive of Jessica throughout their relationship. Their engagement was everything Jessica had dreamed of. She had always talked about her perfect wedding day, and when Adam proposed, I was genuinely happy for her.

However, I started noticing some things that didn’t sit right with me. Jessica had always been a bit of a perfectionist, but as the wedding approached, I noticed her becoming increasingly distant and secretive. She’d cancel plans last minute, seemed stressed out all the time, and started to show signs of not being as excited as she once was. I tried talking to her, but she brushed me off, saying she was just nervous about the wedding and the pressure of everything going perfectly.

But then, things started to unravel.

One night, after a particularly strange dinner, Jessica broke down in front of me. She confessed that she had been seeing someone else. It wasn’t just a fling—it had been going on for months. Her new lover was someone from her yoga class, and she said she was in love with him. She admitted that she had been questioning her relationship with Adam for a while but never had the courage to end it, so she had been secretly seeing this other man behind Adam’s back.

I was in shock. Jessica was about to marry Adam, and yet she had been cheating on him. But what made it worse was that Jessica was so conflicted. She wanted to keep her life with Adam, but she also wanted to explore this new relationship. She wasn’t sure what to do, and she asked for my advice. I was torn between being a good friend and doing what I thought was right. I told her she needed to make a decision and be honest with Adam before things went too far, but she didn’t want to face the consequences.

The situation grew even more complicated when Jessica asked me to keep her secret. She begged me not to tell anyone, especially Adam. She said that revealing the affair would ruin everything—her engagement, her life, her happiness. She claimed she needed time to figure things out before making any decisions. As much as I cared for Jessica, I couldn’t ignore the fact that what she was doing was wrong. Adam deserved the truth, no matter how painful it might be.

After thinking it over for several days, I decided to tell Adam. I knew it would destroy him, but I couldn’t live with the guilt of keeping such a huge secret. I sent Adam a message, telling him everything I knew, and then called him to explain the situation. He was devastated, and I could hear the hurt in his voice as he tried to process what I was telling him. I told him that Jessica had been seeing someone else and that she wasn’t sure about their relationship.

The fallout was immediate. Adam confronted Jessica, and she tried to deny everything at first, but eventually, she admitted to the affair. Their engagement was called off, and Adam moved out of their shared apartment. He blocked both Jessica and me on social media, and I haven’t heard from him since.

Jessica was furious with me. She called me a traitor and said that I had ruined her life. She couldn’t believe that I would expose her secret, especially since I knew how much she struggled with guilt. She said I betrayed her trust, and now, she had lost everything—her engagement, her friends, and her relationship with Adam.

Now, I’m left feeling torn. Some of my other friends have reached out, saying that I did the right thing, and that Adam deserved to know the truth. Others, however, think that I should have stayed out of it and let Jessica handle things on her own. I don’t regret telling Adam, but I can’t help feeling guilty for the way it all turned out. I don’t know if I’ll ever be able to repair my friendship with Jessica, and I wonder if I made the right call.

So, AITA for exposing my best friend’s secret and ruining her engagement?