Guy pretending to use his cell phone?

Anonymous
What does it mean if a guy always takes out his cell phone whenever he sees you, or are left alone with you? And he never seems to make eye contact, he always looks down at the floor when I'm near him. :(

This guy is in one of my class and I would really like to talk to him, but I cannot seem to find the 'right time'. It seems as though(maybe wishful thinking) that he packs up his belongings as the same rate that I do after class ends. He used to sit next to me in the beginning of the semester, but sits elsewhere now. I don't know whether his avoiding behavior is because he is actually interested and nervous, or if he is simply uninterested and trying to get the message across. Any answers from you guys would be appreciated!

Updates
+1 y
i tried to build up the courage to talk to him, so I followed him after class and walked behind him in the hallways in hopes that he would get it, (he was probably conscious of my presence), he seemed to avoid me by walking in the opposite direction later
Updates
+1 y
Also, if his friends start becoming friendly with my friends, does that indicate anything? He and I haven't talked at all, yet.
Guy pretending to use his cell phone?
2 Opinion