My boyfriend VS a guy who likes me?

[Julienna]

I have a boyfriend, i love him and I'm seeing him tomorrow. There's this guy, His name is..let's just say S. he's friend with my boyfriend also but they don't talk for a year now. S, he followed me on instagram and he said he wants my fb, so I gave him mine. We talked ever since he added me!

I think I started to like him too, but I cannot, because I love my boyfriend, also.
I've never flirt back though, I wouldn't say im cheating on my boyfriend because I'm not.

I don't know what to do, I can't like them both.
please help?
He said he likes me too, and he said that if I were single, he would dated me.