He's either shy or he likes you. If he's new he might just be shy and prefer to hang out with people he knows. :)
There is a guy with whom i take few of my classes.he always tend to sit near me , behave strangely around me as if he is being uncomfortable and confused.but outside class he don't follow me.is he interested? He hasn't approached me yet
How about approaching him and getting to know him. Then you'll have your answer.