Boyfriends bitchy friends shit stirring..

So guys this is gonna be a pissy rant but I need to vent and get this off my chest and also have no idea what to say to my bf!!!

So earlier my boyfriend very casually showed me a text that his 'best friend' sent him. Now my heart dropped and then started racing as I was reading so I only skim read it but it was kind of like 'we don't like what you've become everything evolves around YOU and your GIRLFRIEND we don't see you anymore we want the old you back' etc etc and he's now got to choose between me or his friends. LIKE WHAT THE FUCK. I'm in a Facebook group chat with them and they were all so nice to me but there's this one girl who is the shit stirring bitch that sent him that message and she started this little group against me, I'm not sure who it is but I think it's 3 or 4 of them that have always been a little off towards me. So he sees his friends every day at school and hangs out afterwards, I see him every Sunday at the most. So I don't really feel like it's my fault that he doesn't see them cause he has every Saturday to see them and hang out after school so I don't get why she's bitching about not seeing him. Also before he was friends with me then eventually dating me he was really depressed so like what do they want him to go back to being depressed? Because that's how he was! I honestly don't get how best friends could do something so bitchy. He's now got a week before half term is over and he hasto make up his mind wether he keeps me or them and tell them his answer. And I'm honestly so scared he'll choose them. But I don't know what to suggest! I mean I'd say I'd see him less but I don't always get to see him every week so surely 2 or 3 times a month is pretty much as low as you can get?! I'm so pissed off at his bitch of a friend for putting him through this. We're getting on so well and we're both so happy together but now she's come along and fucked it all up. Thanks for reading I know this is a long post I just really needed to vent 😓