<human>: I have general anxiety, and have been cheated on in the past. I know she won't cheat on me, but my experiences in the past make me very uneasy about it.

Is it unreasonable to not want my girlfriend train at the gym with her ex boyfriend from over a year ago. He was her first and only boyfriend before me. She see's him as a friend, but I dont. This is the first time a girlfriend has been friends with an ex partner, so its a new experience for me. 

My girlfriend understands where I am coming from, but does not like. She hates being told what to do, but is not.angry or anoyyed at me

Anyway, my question is if I am doing the right thing? I am.starting to get use to them talking, but I would rather they not hangout.

Could you distill the essence of the text into 1-3 sentences?
<bot>: My girlfriends ex boyfriend wants them to train together and I told her I dont want them to. Am I doing the right thing?