My (27F) boyfriend (28M) is obsessed with my ex (27M).

We’ve been together for 2 years and before this, I would say our relationship was very close to perfect.

At the beginning of the year though, my boyfriend and I were at the grocery store and we bumped into my ex and another friend. This was the first time they had ever met each other. We made polite conversation before going our separate ways. My boyfriend made a sarcastic comment about how nice my ex was when he was out of earshot. I didn’t think much of it at the time.

A few weeks after this, I noticed he was on my ex’s Facebook page. When I asked him what he was doing, he shrugged it off and said he was curious because he saw my ex had commented on Luke’s (a mutual friend of ours and my ex’s) post. He’s since friended him on there and claimed my ex was the one to initiate it.

He’s followed him on Instagram and twitter too. He comments on a lot of his posts too but my ex rarely comments back. He also somehow got Luke to invite him to my ex and his friends’ weekly (virtual) hangouts. I mentioned I found it weird that they were hanging out but he dismissed it and said it wasn’t a big deal. He’s also started talking about changing his career path to what my ex is doing and makes snide comments about if his dad paid his way for him, he could take me on fancy trips too.

He’s also become incredibly passive aggressive towards me and makes comments about how if my ex didn’t move abroad for a few years we probably would never have dated. If I say no to anything (including sex) he comments about how he bets I wouldn’t say no if my ex was the one asking. He also got really sulky when he realised I still had a gift my ex gave me.

Yesterday we had a massive fight over it because I wanted to spend time together, but he ditched me to go hangout with my ex. I got so upset I told him he might as well date my ex instead.

I don’t really know what to do now. He’s giving me the silent treatment and I heard him tell my ex what I said which is really humiliating. What can I do to make him stop hanging out with my ex?

TL;DR – My boyfriend is weirdly obsessed with my ex and has gone out of his way to join his friendship circle. He’s also become passive aggressive towards me since spending more time with him.