Am I wrong for asking this of him

So my bf is best friends with this girl who is married. They met in college and are both the same age, 22. My bf and I have been together for 9 months and he has like three female best friends. He told me he never had anything with any of them but I just found out yesterday he slept with one of them before we got together and has a flirtatious relationship with the other two that’s on and off. The married one constantly calls him to vent about her marital problems and she has cheated on her husband twice. I found out that while I was on vacation for two weeks they met up and went bar hopping and he lied to me about it. I asked if I could go through his phone and I saw that he would slide down on her ig selfies calling her hot like 6 months ago and then did that last week with his other female friend and he’d tell her stuff like "slay queen ❤️😍” I told him I am very uncomfortable with these friendships and I can no longer move forward if they continue to be friends like this. Also my boyfriend and I have known each other since we were 10. We have been childhood best friends since then and I feel like I never really knew him. I never expected this