Im not gay and I don't think it is normal gay behavior. I saw him again at the gym and he seemed to be trying to impress me with his weight lifting and posing in the showers.
Yesterday he asked me what brand of jock strap I was wearing. I told him and he asked what size I was wearing. This was in front of other guys and no one seemed to look at me like it was odd. Maybe he is comparing himself to me (like a contest in his mind).

People show their true self through their actions, not their words.