You can easily find out if a guy likes you....just stop calling him, and next time he gets on the computer, you get off. I know it sounds weird but the less interested (but nice) you seem, the more the guy will want to be with you....that is IF he is interested!!!!
Just be yourself, be nice, but don't go out of your way trying to pull him closer. You should know in a day or two for sure!!!
I know how hard it is sometimes, keep smilin and good luck!!!