Is NOBODY wrong in the post ? POST : I have a friend of more than 20 years. She was a bridesmaid at my wedding, and we have been close for so long. When we were around 18 or 19, she was there for me when I fell in love with somebody who didn’t feel the same way. I was heartbroken, and completely devastated. We used to “fool around” when we got drunk together but I put a stop to it when I found out he’d had a girlfriend the whole time. Like I say - heartbroken.
I met my now-husband not long after and we have been together for 9 years - fairly happily I might add. However, on a night out with my friend a few years ago we run into this guy and the two of them start flirting. I get upset by this and ask to speak to her privately, but she refuses. I walk away and they start kissing. I get a little angry with her, we have an argument and I leave. I know that I am married but seeing him and then having him flirt with one of my friends bring all the awful feelings back for me. He didn’t want me and I had to deal with that, it was very painful. I’m not entirely sure that I have ever got over what he did to me, or if I ever will. I don’t doubt that I made the right choice in marrying my husband, and I am fully aware this other guy is a complete effing tool.
She said to me that nothing would come of it, but I found out they had a few dates and I still see them following each other on social media, liking each other’s posts. Whenever I see this it makes me feel sick. She knew how I felt about him and I know longer feel I can be her friend because I get upset whenever I think about what happened. 
I know that I am married and I was never officially “with” this guy so it could be considered a grey area, but am I an asshole for not wanting anything to do with her, or do I just need to get over this? It is a difficult subject to speak about and I do not wish to rake all this up again, but I am finding it more and more difficult to spend time with her.