Bfs crazy jealous

So I have homecoming this Saturday I’ve been with my boyfriend for two years now and we’ve had little fights but nothing this serious .. he’s pissed but my guy best friend who I have lived near and been friends with since first grade asked me to homecoming as friends my boyfriend is older than me and couldn’t go anyways so I said yes to my friend who’s helped me through so much and always been there for me ! Now my boyfriend is crazy jealous and mad and says if I go he won’t talk to me he might leave me ect ect we’ve never had any cheating or trust issues in our relationship Before and he knows I have guys who are just friends that I met way before him it’s not fair for me go just cut them off because I’m dating someone I make time for both of them now my bfs some stage five clinger please help