Boyfriend and I have been together for about 2 years, and he has always had a thing with jealousy

I went to the pub with my best friend, and she knew the owners son, and when he got off work he came to sit with us. Then a couple other people who worked at the pub came to sit with us too. Men and women.

Now my boyfriend is angry with me. I told him if ppl join me and her they’re only ever friends and so it shouldn’t be a big deal, it’s only happened like three times in the last 3 months. He says it would’ve been fine, but I’ve never told him when and who joins, and now he doesn’t know what to believe, and is super mad with me.

I mean I defo could’ve told him, I have nothing to hide, I just didn’t think it was a big deal.

I’ve told him I’m sorry for not saying when ppl joined us, that I never meant to make him mad, and I will definitely tell him if anyone joins us again, and that I just didn’t say because I didn’t think it was a big deal, but he’s still angry.

What do I do?