Please help meee, is this normal?

Okay, so i'm 17, me and my boyfriend have been together for two years, even though it is a long distant relationship I thought he was "the one" anyways everything was going good till one day I was being bored then searched his name on facebook, I found out he was lying to me, He lied to me about going to parties, he said he doesn't drink or go to parties and there was pictures of him at parties and drinking, etc. There's also times where he said he was at home but on his facebook status he will say where he is and he also talks to girls, like alot of them, they ask him when he wants to hangout and he always says yes and jokes around with them, their very pretty girls too so maybe this is just me being jealous but I feel lied to and i've lost all trust to him, I still haven't told him that I looked though because I don't want to look nosey, Can some please tell me if this is normal or if I should leave him? because this is driving me crazy, it's been like 5 months since I knew :/