I want to make peace with my ex 2 years after a TERRIBLE breakup. Bad idea?

[Jill]

WOW! I think she has many wrongs. I wonder if you wish you would have done more to try and save the relationship?

I don't see forgiveness yet or any type of cordial relationship. It is obvious to me although she ended your relationship she had feelings for you and still does. If she didn't she wouldn't care about your new life. Perhaps she is only marrying this guy because she knew you wouldn't take her back???
I think she has regrets but is too immature to even admit to them. If a person is truly happy they don't look back and still cause pain. They are too busy in their new lives. I would hold off for now and get on with your life. Issues still need to be resolved . To me it sounds like she is hurting. I would let sleeping dogs lie for now. Good luck.