<human>: Could you distill the essence of the text into 1-3 sentences?

Okay, so I have a friend who I met through online gaming and have known for a few years whose SO recently broke up with him. He's a bit awkward and doesn't have any IRL friends apparently. All of the friends he had, for the most part, were mutual friends of him and his SO and when they broke up, most everyone who he considered a friend cut ties with him to continue being friends with his SO. Now he constantly tries to keep in contact with me to the point where it's almost harassment. It's quite obnoxious, and I want nothing more in the world than to tell him to fuck off and be done with him, but ethically I can't. This isn't aided by the fact that he told me that I'm the closest friend that he's got; I don't want to be that.
<bot>: Random internet friend's SO broke up with him, took all of his friends, I'm now his closest friend and I don't want to be >_>