I have been with my boyfriend for almost 4 years. We spoke about moving in together this upcoming August. We never had a real argument until last June. He went to a guy’s party (he told me he was going to a party but didn’t tell me who it was). I found out the guy who had the party was a guy who went into my boyfriend’s DM and was flirting with him. I found out who the guy was by snooping. I confronted him and told him I didn’t feel comfortable with him going. Long story short, he still went even though he knew I was uncomfortable. Today 5/19 I found out they are still talking. The guy posted on my bf birthday picture saying he wish he could celebrate with him. Now I feel some type of way that they still talking. I also feed disrespected due to the fact one of our only argument was about this guy and it seems like it doesn’t matter to him.