Should I delete my ex bf off facebook?

[Abi]

This guy really hurt me but he seems to think like what he did was no biggie. I tried to fix things up between us (become friends) but he ignored my msg so I left him alone. When we had an argument, he said he didnt like me. He still stares at me and I get the impression he wants to talk to me. My friends catch him staring all the time and he flirts with other girls when I am there. Honestly, I am hesitating to delete him off my facebook because I dont want to be rude and another reason is that he might be able to see through my facebook that I am happy without him? I feel so bad :/

Btw, the reason why its so hard for me to delete him off facebook is that he was so nice about it? but his words were full of lies..