What do I do

Hi so my friend invited me to her Quinceanera/ birthday party and my bf doesn’t want me to go and is saying he’ll break up with me if I go and will stop spending money on me and I don’t want to break up with him bc we’ve been together for 2 years now but I feel like he’s being controlling and irrational. He’s saying I’ll just wear pounds of makeup and wear something slutty and get ganged banged by guys…. But I told him I won’t wear anything crazy just a formal dress or something and show him but he doesn’t care. Me and my friend used to be close but we still talk and call every 2 months I’ve known her since the 8th grade. Should I still go to her birthday party?