What are the signs that a guy is not into you?

Are you kidding me? Guys are easy, they are much less subtle than girls and will pay you a lot of attention if they are interested. If a guy isn't interested, he'll give short answers or blow you off in a nice way.

I personally tend to have really bland conversations, and don't flirt, and don't show much of a sense of humor. Because if you have a girl laughing and you don't like her and you aren't friends, then you need to stop that. But girls need guys that are funny so there ya go. Also I think that if you REALLY don't like the person then you are really self centered and try to annoy her.

Well..I would like to know the answer to that myself cause I had a guy act like he was interested in me for over THREE YEARS and then was able to DUMP me just like that! As I said in my question, I just don't 'get' guys!