Stalker

Remember the pathological liar exboyfriend of mine? He showed up on my doorstep the other day. It's a little creepy. He just won't leave me alone and I'm getting freaked. He called me today asking why people were saying he was stalking me. I wonder why... I've tried to be nice to him but I don't know how much more I can take. I was gonna tell him off on the phone this afternoon but then he said that I was pretty much the only friend he had left from our school since he graduated. I feel so bad but I can't keep pretending to be his friend, can I?