What to do when my boyfriend hangs out with girls when him and his guy friends are out?

hi, I don't know if my boyfriend goes and looks for theses girls. his friends are the ones that bring them along on their hangout. three weeks ago my bfs best guy friend called him up and asked him to met him at this bar. my boyfriend called him and he didn’t answer. my boyfriend shows up at the bar and his friend is there with a girl they both have known for years. however this girl is a total slut!!! showing b00bs, showing her a$$ and wearing lingerie on facebook and instagram. he didn’t tell me she was there, i found out a few days later. him, his friend and the girl took a picture together and his friend posted it on his instagram stories. when i saw it i immediately called him and he told me the truth. he said that nothing happened and yes i believe him in that sense but why would he hangout with a girl with his guy friend and not tell me about it. also another incident was last year in October we were in a really bad place constantly arguing and he went out to eat with a group of his guy friends and two girls that knows one of guys showed up. there were two seats open next to my boyfriend and they sat next to him. they ended up following each other on instagram and my boyfriend DMed one of the girls memes. in November i found out he hung out with them because both of the girls posted a picture of them three of their stories. my heart broke when i saw that. i understand that you can’t make someone do something but i want to do something to make him not want to hangout with girls. i’ll admit i constantly complain about something towards him. so maybe just maybe if i don’t complain and be nice and a good time when i am with him he won’t want to be around them? someone please give me advice?
What to do when my boyfriend hangs out with girls when him and his guy friends are out?
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