How do I let this guy know? update—

I’m 16 and I’m a junior in high school, a couple weeks ago this guy (15) started hitting on me and then I was talking to someone. Now I have a boyfriend and the guy has a girlfriend and he’s still kinda touchy, sometimes when I’m in class he’ll push me and then try to talk to me, he’s hit me in the face with a paper to get my attention when I was purposely ignoring him, and he just constant is just touching me in some type of way when he walks up to me.

My friends tell me to say ‘f off’ but I don’t wanna be mean to him because he’s also in two of my classes.

update—

he did it again today and I ended up texting my friend and she told me it was harassment so i text him and told him basically to lay off and i also text his gf.