Relationship drama with ex and female friends..

Please help me out here. I’m very aware I am in the wrong but I am reaching out for advice to help me understand/get over it.

The last 2 months my relationship has kinda been a shit show. I moved to a different state and my boyfriend was (is) going to be moved down here next month. Now we’ve had some issues in the relationship where he’s been extremely insecure about my past and that I’m divorced. He started showing these insecurities more the last 2 months and I think it’s due to all the stress of us moving (we were already living together before). Now here’s the kicker. A few months ago we went to his home town and we bumped into his ex. Like THE ex. The one he supposedly hates so much. The girl who he was gonna marry. Well they disappeared together without my knowledge for an hour to go talk. Yes, just talk. But it was a total shit show and extremely disrespectful to me. His friends actually backed me up on this one. Well after he apologized, even cried, and said to not worry about it. He needed closer but she’s blocked on everything. Fast forward to last month he was visiting me and I caught him texting her. He tried so hard to cover it up and lie.

Well then he started using the fact that I am divorced, and that my ex and I do not hate each other (bc we were children and never in love when we got married) to go over the fact he texted his ex secretly. So since then and until now it’s been rocky but he came down to see me this weekend and we got our shit figured out.

He’s going home to visit his family and friends this weekend and he plans to go bar hoping with 3 female friends and a male friend. I know 2 of the girls. One is single and kinda makes me uncomfortable around him but there has never been a reason to actually tell him to stop hanging out with her. I mean they have been friends for years. The other girl is going threw a divorce and she’s a mess and is confiding in him for comfort. Again, he’s best friends with her husband so I’m not supposed to worry. But WHY am I still so worried????? Why am I so paranoid?? I was not like this before! I feel SO UNBELIEVABLY uncomfortable with him going out with them and I have no reason to be, the only reason was him lying about texting his ex!! How do I get over this? It’s driving me crazy and understandably pissing him off as well. He also doesn’t understand and says it’s crazy and controlling of me which is understandable.