[bitesize]

Don't take him back ~ it's ovbious to me that you don't want to be with him, so whatever you do you shouldn't be pressured into doing something you really don't want to do. He shouldn't be trying to guilt trip you into it. It sounds like he likes you quite a bit, but he's having trouble accepting that you don't want to be with him.
Maybe were you a little vague with him when you ended it?? Often when I lose interest in someone I feel uncomfortable admitting that to their face so I can get a bit vague about why I don't want to be with them anymore, and they can have trouble getting the message, so I know how you feel.
Try to put yourself in his place ~ if you really liked someone but were sonfused as to why they didn't seem to want to be with you anymore, you'd probably want to hear the honest truth, but not in too much of a harsh way, right?? Don't worry about what he might say to his friends ~ thee's no reason for them not to like you anymore if you're decent enough about telling him your feelings. Just explain to him that you don't really feel the same way that you did ~ and it's nothing that he did or anything ~ and you could maybe do with a little space for a while. If he's mature enough he'll understand that and back off.
Good luck (: