How do you know when a guy likes you?

sounds too me that you might like this guy! um? anyways i think if he is quite a lot at school & than on the internet totally out there. i would look at it on the internet. he says no on the internet too her. he's not the same friendly guy on the internet. I would say NO! Even if he did like her I wouldn't want too be with someone who has two sides to his mouth.