Should I feel guilty for not being in love with someone who's in love with me?

Ever heard the phrase "hope springs eternal"?...and love especially make that even more true as well as near impossible to let go of. A person cannot help who they love and neither can a person help who they don't. You have no reason to feel guilty because you do not share his feelings. That is something that is his issue and he needs to admit to himself that his love is in vain and move on. You don't have to be mean to him but you may have to show anger and sternness to get the message across (which is not being mean), then follow that up by not engaging him more than maybe a brief "hello" when you see him. Trying to be nice about it and worrying about his feeling being hurt only makes it appear that you are just "playing hard to get" and that there is still a chance because to him, somewhere inside you have the same feelings and interest. He may be hurt by your rejection and you may feel badly about that, but he will need to go away and lick his wounds for awhile then move on....eventually his feeling for you should become just a fond faded memory to him.