Am I crazy or is it js men ❤️

My boyfriend of has been acting so weird, he barely cares now and we’ve been dating for a year, it all started last week when my ex bsf said she apparently saw me cheating, on that day I was home stuffing myself w snacks and watching my show like omds, so now he’s being distant, he puts his friends above me and even cancelled on our date to hangout with his girl bsf, am I going mad because he said he js “matured”