Most Helpful Girl
You've stopped him in his tracks in the past when he's flirted or acted like he was interested in you. It sounds like he was interested in you at some point, but he's just fallen back to what you were requesting -- that is, a purely platonic friendship.
As far as him being gay, why don't you ask him? You can couch it in such a way that he's not offended by the question. Though a gay man is not going to have a fetish over women's feet.
You've turned him down enough times that he's given up. If you'd like to develop something beyond friendship, take the initiative and invite him to hang out with you next time, and see if you can't throw a few flirts his direction.