I miss my ex-best friend. Also, cut your ex some slack. His automatic go-to after we split was to go on the offensive. When one thing happens, your mind automatically springs into action. Or is she just an attractive person who finds you attractive, too? I found out about this the hard way, in a similar situation. But you should try and handle it with grace.
Find a reason to gain value in your own self before seeking the approval of strangers.
It’s never OK to date your friend’s ex – and this is why
But you should try and handle it with grace. She's a cheater, and always will be. Any so called friend who would hook up with your girlfriend behind your back is a back-stabbing fiend, and not worth having around. In my opinion this demonstrates a complete lack of self respect. What surprised me was that I had to learn about it from a third party, since I would expect and very much prefer Mike to approach me and tell me about it face to face. I will however try to work things out first, as EmC suggested. Just pair it with a healthy supplement of reality.