Mostly venting: Over a year ago, right after our second date, my now gf, slept with her friend, K. She told me when things started to get serious between us, and it kind of destroyed my self esteem. We ended up breaking up for a few weeks (she felt I lacked personality, and I was extremely insecure at the time). She came back because she missed me. It's been a year. Things are good between us. I found out I have BPD, but she's understanding, etc.  
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I just found out that the girl I dated before her, who dumped me for her ex, is now seeing K. I had healed from all of the past drama, but now seeing that, the pain is starting to creep back in.  
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My gf thinks it's funny in a "what a small world" way. She called up K to hear all about it. For some reason, she told K that the other girl and I "never really dated/just hooked up", so it's not a big deal, and they invited us out last night.  
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I've always been strictly opposed to hanging with exes, though my gf does not feel the same way. I hate all of this. For some reason, seeing the girl who dumped me with K is stirring some shit up for me. Now my gf thinks I'm upset because I'm not happy in our relationship. I'm trying not to be reactive, or let the pain take control, but I just wish I could erase it all from my memory.