Does he like me? or is he just messing with me?

Does this guy like me?
We're both juniors in high school. we're in the same spanish class and he sits in front of me...

he always turns around to talk to me
he always holds my hand... kind of in a joking way.
he has a girlfriend but he hates her. one day he went on for about 10 minutes to me about the things he doesn't like about her. and how he doesn't believe in their relationship.
he gave me his number and always jokes that we should hang out.
in class he always says things like "her and i are dating" (about me and him) or he tells his friend (in front of me) that "we're practically dating"
he notices small things about me. like my nailpolish changing and my necklaces
he always teases and picks on me
he'll start talking dirty as a joke
we have playful staring contests and thumb wars
once we were texting and we got to the subject of his girlfriend. and when i asked how they were doing he said "we're alright... but if you were in the picture..." so i asked him what he meant by that and he said "i cannot express to you what i mean. my feelings are just too complex." so i responded by asking him to try. and he said "no. i cannot. perhaps when i am once again single this will be easier haha"

so what does all this mean? is he just playing me? joking around? does he like me at all?