Any advice to help me get over my bf having girl bestfriends

I will take criticism, encouragement, advice, just anything at this point.

Here’s a little information about my situation. So me and my bf have been together for a year and 2 months and everything’s been okay except for the fact he wants to talk to these 2 girls who he claims are his best friends. Both of these girls don’t like me bc they claim that I “took him away from them” I’m not really a big fan of them either. When one of his girl friends wants to talk to him, she wants to talk to him when I’m not around. She wants to talk on the phone with him so nothing is saved as far as what they talk about. I don’t like that at all and I’ve told him that and he says “well if you actually try to get along with them then they might not feel like they have to talk to me privately.” I’m okay if he talks to them every now and then I just don’t want him talking about our relationship to them bc they are quick to judge me and he doesn’t defend me. He even got to the point where he was deleting messages between them bc he says he got scared that I would get mad at him for talking to them and so he deleted the messages and then when I asked him about it he lied to me and I had to threaten to ask one of the girls if he was talking to her just for him to tell me the truth. He says he’s been friends with them since before he met me and so they’re family to him and that he shouldn’t have to stop talking to them just bc I come into his life. I told him that I would eventually leave him bc he doesn’t take anything I say about them into consideration. But if they tell him anything about what he should do about me he listens to them. I just feel like I’m in a 3 person relationship. Him and us 3 girls. I feel like he loves all of us the same except I’m just the only one he has sex and lives with. I know I’m jealous and I’m trying to trust him but it’s just hard. What would you do in this situation before you chose to leave him?

EDITS:

@Ashley as far as I know he hasn’t told them to respect me. He just treats me like my opinion doesn’t matter when he talks to them. I feel as if they think they have power over me when they get to talk to him privately. It’s like they like the feeling of making me jealous and as if they’re winning him back or something. They get mad when he doesn’t talk to them for a couple days and they make the comment that it’s bc of me and that I won’t let him talk to them and he doesn’t correct them. He tells me that it’s bc he doesn’t want to talk to them and that he wants to spend time with me and then he lets them blame me for him not talking to them and he doesn’t say a word. As far as I know they haven’t talked anything about hooking up or have ever hooked up before but I know they like to post a lot of bikini pics and stuff like that and he likes all of their posts. I don’t know the whole thing has me all confused and angry and sad at the same time. I don’t wanna leave him I just want to somehow get over him having the girl friends. I don’t have any guy friends or any friends for that matter and I guess I just feel like he’s my only best friend and now I have to share him with other girls?

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