Help?!?

So last week I thought my boyfriend was cheating on me so I finally confronted him and he said and promised me he wasn’t and he’s never broken a single promise so I believed him but today well more like 10 minutes ago he told me he likes the same girl I thought he was cheating with so I don’t know what to do and I’m an emotional wreck because this has happened before where my boyfriend has cheated on my best friend (not this boyfriend) so i don’t know what to do anymore