He's someone I had classes with in college. I thought I made it pretty clear to him. The first time he asked me out, I told him I was already in a relationship, which at the time was true. I gave the whole I'm not interested in a relationship right now but that doesn't seem to serve as a deterrent.
I run into him in the street the odd time. It's gotten to the stage where I consider crossing the road just to avoid him. Worse part is he's not exactly my age. I'd say he's got a good 15+ years on me. Think he's got a few screws missing, I'm probably not the only one he's pestering.