Am I in love ?

Okay so here is the story..I really like this guy..I relly really like him,I think I might be in love with him!! But im not sure because I have no idea what love is.how do you know when you are in love? I cant stop thinking about him..everytime I see or talk to him I get butterflies…I cant even talk to him properly because I have no idea what to say…it kills me because there are a lot of reasons not to like him..he has a girlfriend:( and I hate her…well I know her…another thing is he loves himself and he knows he can get any girl he wants…but he is so charming and so funny thats mainly why I like him…I cant even like another guy because I just cant think of them in the same way…he just does something for me…it drives me mad because I cannot stop thinking about him…this has been going on months…and its not as if he doesnt like me I heard he does..but its not as simple as that yano? Does anyone else feel like this? Am I in love? Because it feels like it