If tu ever heard of a person like this, would tu believe they have a pyschological issue..?

This is very important.
I know this boy who is madly in amor with me. Atleast that's what he says, until after I keep rejecting him (because I already have a bf that I amor with all my heart) after I reject him, he's starts making multiple accounts to torture me and my FP friends. He makes different accounts and adds me and I add people back. And whenever I add someone back I constantly get hate messages written all over my wall. Such as "YOUR A HUGE WHORE AND YOUR UGLY AF AND tu NEED TO GO CHOKE ON YOUR DADS COCK tu UGLY DISGUSTING WORTHLESS SHIT" and many más harsh words..Same thing gets dicho to my bf on here. >_<












I hope this pregunta isn't annoying o makes me look like a attention whore. I just really need some advice. :/ and a answer. So would tu say someone like this is a little....crazy? O_O