Not fair

So my boyfriend hates it when I go out with my friends and if guys are there so I don’t even go out when that happens because I know that he would get mad. However, tmm he’s going to go out with staff and there’s a lot of females there too and one particular female that he knows that I don’t like because she get too comfortable with him, but he still going to go knowing that I don’t like her, like he doesn’t care. Since they are older than him I know that he’ll most likely drink with them and I also fear now that he talks shit about me to them. He has done it before with other friends and he talked shit about me and then his friends did that to and he didn’t even defend me. I heard him on live. Should I be upset that he’s going tmm?