Am i being irrational in not wanting her to go?

ive been with this girl ive never cheated in my life she found a tape from 8 yrs ago and dumped me kissed her ex(as far as i know thats all) and had a party and lied to me about her ex being there i have gotten a bit paranoid thinking she is with some one else cause she won't take me back well last night she told me she was going to a wedding of my ex friend who slept with my daughters mother when we were together 8 yrs ago and her ex is in the wedding to well i got pissed about it cause i got invited but didnt rsvp because i didnt care to go bieng he is a dink i dont forgive betrayal well she said i need to get over it and she dont see why i cant and im bieng unrational. is it right that i ask her to not go and hang with people i hate because i hate them?