Does he like me or is he just being nice? (short question)?

[Rosie]

There's this shy guy that I'm crushing on big time. I'm outgoing and he's shy. We don't go to the same school but we have an after school class together. In person, when I talked to him a couple weeks ago (the only time we've spoken in person) he was so shy and barely spoke. I did most of the talking and he just smiled most of the time (he smiles a lot). I took up enough courage to add him on facebook and chat him. this was the conversation:
me: hi(:
him: hi
me: what's up?^_^
(it took him days to repsonse)
him: Oh gosh, i'm sorry. Ntm, how about you?
me: LOL it's ok haha i guess you don't go online too much, but i'm okay- I'm kind of sick.
him: hahaha, hope you feel better(:
me: thanks I want to get better before finals. everyone's getting sick now
This is how far it's gotten. He liked my profile picture, too(not a new pic). Do you think he could be interested in me? i know really shy guys tend to like girls that give them friendly attention.