Could this have any relevance to me?

Hmmm...it's kinda hard to say because body language plays a big factor. He may not be coming onto you and the fact that you know he's bi might be tripping you out a little. But then again, as humans we are pretty good at knowing when another person is hitting on us. It's some kind of chemical thing that we all pick up on, some better than others. I guess just ignore it for now and see what happens. If stuff like this keeps happening, you can prob bet he's interested.