I think the guy was showing off and seeing what attention he could get. Clearly he was successful, at least with you. I don't know why so many people are telling the OP to chill, though. Sounds to me like he was discreet. Plus, just because someone sees an attractive person and is sexually stimulated doesn't mean he has to change his percentages of how he views himself regarding gay and straight. Those are very fluid percentages in the first place. Besides, if most guys are honest, when they're horny enough, a brick wall can be sexually stimulating. So give the OP a break and let him enjoy the scenery (and the resulting penile pleasure, too).