This guy is guilt tripping me. What do I do?

i met this guy a few weeks ago...well id seen him around and he requested me on Facebook and started talking to me. he dated one of me old friends a couple of months ago. she broke up with him. according to her, she never really liked him, but she felt bad. when he started talking to me he told me about how he's available and kept trying to flirt and such. I told him that I liked someone at my school(which I really do).

we've hung out twice since then. he had other friends there, so there was no confusion on whether or not it was a date. he did put his arm around me a few times, but he's also a very affectionate person and does that a lot to girls...he just did it more to me.

so last night he called me at 2 in the morning to ask me out. I tried to make it clear that I didn't like him more than friends and that I was really sorry. he called me at 5 in the morning to tell me once again that he liked me. and was texting me this morning about it. he even told another friend of mine about how upset he is about it. he told her stuff like how he "cant remember anything from last night except for the the part where I rejected him" and everything. his ex told me he'll try to guilt trip you, so that you'll go out with him him.

i feel really bad about it. I mean I've been thinking about it since last night. I just don't like him anymore than a friend. was I leading him on without knowing it? is there anything I can do?

This guy is guilt tripping me. What do I do?
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