I want to end a friendship because i'm no longer interested in them
I have an online friend I've had for a while- but I'm honestly no longer interested in continuing this friendship I have with him. Part of this is because I've discovered that I just don't want the trouble of having online friends anymore, and the age difference between us has always made me uncomfortable. The problem is, he really adores me and honestly cares about me- I just don't feel the same way, and I know I should feel more awful about not caring about him as much as he cares about me, but I don't- I honestly don't.
I know it's unfair to him if I continue this friendship because I don't treat him like a real, offline friend.
Also: I know he's not a rapist, or any creep online- he has never once asked for any perverted pictures of me, and our conversations don't move into that territory. We've also never spoken on skype or on a cellphone, so I have no idea what he sounds like, or looks like (He's never sent me a picture of himself because he doesn't know how to transfer pictures off his camera onto the computer). None of us have brought up the topic; and I honestly don't want to get on that level of communicating with him offline.
This is more of a "help me, i need advice" post than a typical is it normal post- how do I end this friendship? I feel trapped because I know it's cruel to out of the blue end a one-sided friendship, but I'm just so not interested in this person that obviously likes me, it's not even funny.