Is it normal not to be okay with my bf going to an ex's?
Okay, so I've been with my bf for two years and the whole thing has been on/off.
Basically he came to Uni with a fuckbuddy and went to visit her numberous times at the start. He was clearly really into her at the time and as we weren't properly together I couldn't say anything, though it bothered me a little. Eventually we became exclusive and she disappeared off the radar.
Things have been going really well lately though and I couldn't be happier. However, out of the blue, he was invited to her house for a hot tub party and a sleepover. He hadn't planned on telling me, when a message about it came up whilst I was with him and he couldn't deny it. I asked him not to go and he said okay.
Problem is, he has a habit of changing his mind under the influence of his friends and as he lives far away I'm not sure he won't go so I said if he went without telling me, it would all be over. The only reason is his total obsession with her at the start and the fact he hurt me really badly a couple of months ago (causing so many trust issues). Am I being an unreasonable girlfriend?