Why does he only talk to me online and not in person?

It's so weird. We talk online, everyday. But he sees me at school, (we're in college) and he looks at me, but doesn't say hi, or anything at all. I'll try talking to him, and he doesn't look at me. I only ever see his back. I may say hi, and as he's walking away with his back turned to me, he'll... Show More