In terms of a friendship, just wean the other one off you. Be less available, return calls less regularly, that kind of thing.
In terms of a love interest, the best way to deal with it is to say, hey, I don't reciprocate. Because if you go and get yourself a Significant Other while this one is still after you, of course they'll be angry.
16/05/2007
I'm in your profile, deleting your spams for Great Justice.