DP is amazing, I absolutely love him to bits, but we've had a few problems recently with his jealousy.
We went out recently and an old friend from my uni days was there. We chatted for a while, he went to meet up with his other friends, all was fine. My friends who I were out with started saying about how he'd recently had a child, but it wasn't his girlfriends - we were talking about how, even in his uni days, he'd always been a cheat and as nice as he is we feel really ba for his girlfriend and think he's a bit of a twat. It was mentioned casually that both me and another friend had had a ONS with him years ago and that he's always been a bit of a ladies man in that regard. He also has a habit of getting in touch with both of us only when he thinks his girlfriend isn't giving him enough sex, and if he knows I'm single will always try his luck (I reject him very clearly every time!!) - it's become a bit of a joke among us, and everyone involved knows that nothing would ever happen, he's just being a bit of an arse when he complains to us about stuff like that.
DP got very jealous about it, and on the way home forbade me to go out with this guy. I got really angry and explained that there's nothing going on, and never will be. I explained that I'm not angry because I want to keep in touch with him, but because I don't like feeling controlled by having DP tell me I can't. He says he got so jealous because when the guy was talking to me he was apparently leaning in really close (I didn't even notice tbh) and of course he's going to be wary of a guy that cheats so openly,who I once slept with, and who has propositioned me several times since. We chatted about it and it all got sorted out, he saw it from my point of view, said he trusted me and apologised.
The other night the guy sent me a text (just a general 'how you doing?') and I mentioned it to my DP, making a joke about how I bet his girlfriend isn't giving him enough sex again in his eyes. I thought that by telling DP and making a joke out of it it would help him to trust me, so he knew I wasn't going to hide anything from him. Unfortunately it had the opposite effect and he ended up storming back to his, with us having a big argument. We have since made up and talked about it - he realises he over-reacted and is really apologetic. He says he's devastated because he reminds himself of his jealous ex, and would never want me to feel like he did when he was with her. I've offered to never talk to the guy again (which is really no big deal, he was a good friend in the past but I don't see him that often and his occasional unwanted advances are starting to piss me off) but DP is adamant that he doesn't want that and doesn't want to control me.
I think we're OK now, but I know he doesn't trust me at all. He claimed he does, but when I jokingly pulled him up on it, he admitted that he doesn't. I don't know what I can do to make him trust me. I understand why he got jealous of this guy, but there is absolutely no reason for him to. I just don't know what to do.