Bit of a strange one and I'll try to keep it as short as possible. A year and a half ago, my ex left me for someone else. I was obviously hurt but after 6 months, I'd cut off all contact and got on with life. She was with this person for a year, during which time, she discovered I was going to be working at a music festival she was going to (nothing to do with her being there, I got offered the job) and she kicked off BIG STYLE to a mutual friend saying that if it was her, she wouldn't have done it etc.
Fast forward a year and we'd managed to have a couple of civil texts, basically with me telling her I forgave her for what happened. She is now with someone else (this is all semantics) and found out the same mutual friend is coming travelling with me - and she got angry because I hadn't wanted to do it whilst I was with her (which is fair enough) I also recently decided to join a club at Uni for a sport, which I later found out my ex and her new bf are a part of so I offered that if she lets me know which days she is going, I'll just not go on those days out of respect for her and the new bf yet she kicked off AGAIN.
Why is she so angry?! I feel she see's it as me doing stuff because she's doing it but that's genuinely not the issue (and I have already told her this) so I don't understand. I don't want to be friends with her but I have a mutual friend who gets caught in the crossfire and I feel like I'm not able to do anything without her getting angry (and it's not TO me but to other people) I guess I'm just wondering if anyone can shed some light on the situation or advise me how to proceed?