don't know what to do anymore, feeling powerless

so i talked to him again about that friend of his (previous post) and that was solved, but i just found out about something else. he's in a groupchat with that friend, ap and some friends os theirs and his too apparently. and god, he can't understand why i'm so mad about this, why it's unfair, why is ridiculous and he has no logical explanation for being in that gc.

i told him that they're people that don't care about me and don't care about the affair, that sided with the ap, but he doesn't care!! he says that they tried to be friends qith me before but i pushed them away, that it's up to him to decide if they're good people or not, that he can't just abandon them, and it's all bullshit, seriously.

we kind of forgot about this because we started fighting about something else and when we were done with that i was tired, but i had a dream about it this night and can't get this out of my head. he's being so unfair, he says that he wants to work this out but can't give everything up for me and my insecurities, that me being insecure is putting a strain in our relationship.

he also told me that the friend from last post had told him before that he finds me rude and doesn't really like me and ?? in what world would you feel comfortable telling someone's partner that you don't like them and why did wp didn't defend me or put a stop to this? why does his friends feel so comfortable saying bad things about me to him?? if it was the other way around, even if i agreed with what they were saying, i wouldn't let them talk about him like that to me, it blows my mind that this happened and i woke up to all this frustration and i feel helpless. i want to work this out and i know he does too but it's too much.