Im just so confused?

this guy told me today he liked me we stayed up togeather all night long..hes over protective of me..and he cares way to much for me..he has a girlfriend I have a boyfriend..we he told me he liked me tonight and he was breakin up with his girlfriend cause he was startin to feel like he dont love her anymore..well im startin to feel like im startin to like him and that I dont wanna be with my boyfriend anymore and I dunno what to do..what can I do??..what should I tell the guy that likes me??