Do you think this is appropriate? It is making my boyfriend jealous?

Ok, so im from england and i have recently moved to America. Within the first few days of the high school (senior year), i met this guy and we really hit it off. So anyways, we are now bf/gf. But the thing is, these guys in my cl constantly flirt with me and touch me, which i find inappropriate, and i tell them so. But they usually say 'You look so hot when ur angry...'. They even grab my a s s when my boyfriend is there. Once, my bf even had a fight with one in the corridor because he said 'You know, your red hair and your english accent really turns me on. I think you and me should...get together...sometime *strokes hip/*' I slapped his hand away but then my bf came in and..yeh. How can i deal with these losers? Thnx =]