How to nicely tell a guy you aren't interested

Sylvannas
There's a guy I'm friends with who is really into me & he's always asking to come see me & stuff. It was sweet at first, but now I'm getting annoyed. He doesn't seem to get that I'm a full time college student who also works nearly full time.  On top of all that, I'm not physically attracted to him.  I don't want to hurt his feelings, his family and I are close and he's a really nice guy, but how do I get this guy off my back?