dumbest boyfriend -_-

So we're having sex, it was all good but then he started talking like nothing was happening, that's fine with me to be honest. What's not fine with me is when he brings up a 3 way with our friend (who is really messed up but I still love her) and that he "knows how both of us work". The other day she almost cut herself over being catfished by a guy so I did what I could to make her happy and if that meant treating her like a pet and dragging her by a leash around the mall that's fine with me. I guess that made my boyfriend get the idea of a 3 way from that..... he knows my stance on all that... it just really pisses me off that he did it DURING SEX