You'll all get to know me one day as a failed psychology student who thinks he knows his stuff, so best to take what I say with a pinch of salt!
BUT!
My theory in life is that if you're single and someone expresses even a mild interest in you, it's harmless to let things run their course. If you find the guy cute, why not give things a go? There's no need to take it too seriously. If you're a little bothered by guys who court you and get in with others etc, just say "if we do this, I want you to be loyal" or something, and that way, you're either with a lovely guy with potential, or you find out essential info on the schmoozer and can move on!
Good luck, chill out, relax...and have fun!