How do you know if a guy is interested in you or not?

I need to know your age. If you are over 18, you will know by the questions he ask's. For instance, if he ask's for your phone number, where you live etc. If you are under 18 it is a harder call, because guys that age are usually shyer than the older ones. Believe me, I am WAY over 18 and I am still trying to figure guys out so please know you are not alone! Speaking as a guy, I can honestly say that the best way to find out is to flat out ask him. "Hey, I was curious. I'm picking up a little something between us. Is that just me?" That's non-committal enough to save face if he says yes, it is in fact just you, but it's direct enough to give even the most shy guy the opening he needs if he is interested. ------------------ unrelated, shameless plug: