13 year old boys are, no offense, but complete and utter morons. At least, most of them, haha ^_^ Although, there are SOME nice ones....just be nice to him, try to use sarcasm, and laugh at his jokes, haha :) 13 year old boys aren't exactly THAT complex, so it should be pretty easy....haha ;)
Be his friend, if he's not the kind of guy who thinks only guys can be friends with guys. Get to know him as a person, then make a decision from there. i turned a blind eye to the bad person who was my crush, and it didn't end well. Guys, in my eyes, are able to be friends. And don't let the fact you have a crush on the guy make you blind to his actions.