What to do about this guy!?!?!?

I really like this guy and i just found out he likes me too..but their are a ton of issues. He is so sweet to me, he says im super pretty, and gorgeous all the time. He says he likes me because im funny, nice, kind, gorgeous, and im not trying to be someone im not. He's so nice to me but i figured out that to other people..he is such a jerk. He told my best friend that she is really ugly..to her face. And he said to my other friend that she is disgustingly skinny and told her to cover up those gross ribs. But to me he is so sweet. But guess what? He has never talked to me in person!! yep he said that all to me over text. He says its because he is shy around pretty girls like me and i make him nervous. We both made it clear that we like eachother a lot but there is a big problem..he has a gf! He says he will ask me out when he brakes up with his gf. Its summer now and ill never see him unless he asks me out. Which feels like he never will because his relationship with his gf is endless! He claims he likes us both equaly. He is on my mind allll day literaly..all day all the time. I dont know what to do, help me!!