I (21F) have a long distance boyfriend (21M) who only has girl friends. I am a jealous person, however I don't think my problem with him having girl friends stems from jealousy. I am uncomfortable with him having only girl friends because he hangs out with them one on one…late at night… smoking. I have met the girls and they are all openly cheaters, who discuss cheating on their partners like its nothing. They are also not very nice to me, I can be shy at first but I am not a mean girl. I met one of them and she didn't look or speak to me the whole 3 hours we all hung out. One time one of them started talking about her body count and describing a "hook up" with a guy recently in front of me and my boyfriend. I have discussed this with my boyfriend and he said basically "they're my friends and I'm not cutting them off" or "I can't control what they say to me". I don't hang out with boys one on one late at night or ever put him in a position where it feels like I could be cheating. I want to be supportive of girl friends, but I don't know how to. Any advice?
TL;DR Any advice on how to handle a boyfriend with girl best friends?