Every time I see her (most of the time with her presumptive bf) I just get super depressed. It bothers me that I couldn't give her something this new guy can. I don't want her back, but I don't like the feeling that I wasn't good enough for her. I went through so much trying to make us work and it seems that her new relationship is just fine without all the drama.
Yeah I don't think I've met a person on here who doesn't struggle with this! It sure kicks me in the guts when I think of her in the idealisation phase with another man. But that's all it is, a phase. We all know it's not forever AND if it is forever, he must have had his boundaries ripped to shreds.
Like Turkish said, personalities don't change. Yes their actual 'personality' might change as he/she mirrors, however the dysfunction, the underdeveloped coping mechanisms, the victim complex, none of it goes away, it's just dormant, waiting to erupt again.
I don't have a solution to this as I still feel that way too sometimes. I think my Therapist is starting to address it by saying how important it is to go easy on ourselves and love ourselves for who we are.
You are probably a really good catch, these relationships are literally doomed from the beginning, look forward to the future if you can =)