I need some advice idk what to do

So I’ve been talking/messing around with this boy for a couple weeks now and I wouldn’t have sex with him because I was a virgin but yesterday I gave in and we did it but today I found out that he is talking to someone and is unofficially official with this girl and even though I knew from the beginning that me and him wouldn’t be anything real but I genuinely feel heart broken now because I lost my virginity to him and he doesn’t care about me really :(((