What does he mean????

[Destiny]

Ok I'm gonna make this story short!
There's this guy in my class that is always so mean to me he says stuff to me calls me fat and threatens to hit me. Te thing is he's always serious when he says that though! But then the other thing is he always sits behind infront or across from me! We often chat on Facebook and stuff? Then in p.e the other day we were playing this dumb game and when we were done our group had to hold hands and after the teacher saw we were done he kept a hold of my hand and let go of the other girls hand??? He kept hold of it for atleast 3 or 4 minutes?And he always stares at me in class? He has a girlfriend though? What does this mean?