Boyfriend bullsh*t (venting)

My boyfriend seems to make his friends his first priority and I'm just off to the side. It's never been this way except for this last semester of him being in school.

He doesn't see it as putting me after them, but it's not just something I say for attention. I'm not one to want attention, I'd prefer to have no attention actually. I tell him because it's breaking my heart that the longer we are together the more he seems to grow fonder of them and their affection and not mine. I feel like I'm losing him to friends. Been there done that before with someone else once upon a time... I don't need to go through it again. 

With one of his friends (his sisters fiancé) he can be a real prick towards me, because that's how the fiancé is.

With one of his friends he goes to school early to study with, he completely ignores me and is cold towards me when he gets home.

With his best friend, he turns into this guy who thinks he's better than everyone else and has all this money to spend and then later tells me he regrets how much he spends on shit because he basically feels he has to impress him...

I'm so sick of the multiple personalities..

Thanks for letting me vent! 💔