My best friend kissed my ex. How should I feel?

mjrcat_
So my best friend of 20 years kissed my ex 2 weeks ago. I don't know how to feel about it. My ex and I dated for almost 2 years almost 6 years ago. My best friend, my ex and I remained friends. We really don't know how or why we are still friends but we are. We just grew up together and became childhood friends. We always hung out and went over to each other's houses. We all moved on to different relationships with other people and often times went to each other for comfort and support when our relationships went bad. My ex kinda became our gay best friend Lol Anyway, this is how it happened. I invited them both to a party at my house. My ex picked up my bff that night from her house. I guess things happened when they left my hous that night. My bff said she didn't know what happened and everything just lead to more heated things. She told me they just made out, but I don't trust her. The worst part, I think is that she told me she didn't feel guilty at all for doing it. I'm super nice but I think this kinda hurts me and I don't know how to react. I have no feelings for my ex whatsoever. I am extremely happy in my current relationship and wouldn't trade my boyfriend for anyone. Even thought I'm happy, I still feel kinda weird about this. How should I feel? It feels like they betrayed me in a way but yet again, I really wouldn't care if they started dating. But then again, it's weird as fuck for them to hook up. I would never do that to my best friend. Ever. Currently, I haven't really spoken to both. I'm ignoring them...
My best friend kissed my ex. How should I feel?
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