It could be a friend, best friend, famous person, brother, cousin, any other family member, close friend family member. Don't think of the negative but if you want to ask him who it is, ask but don't be snippy when asking. Hope it goes well! xoxo
Come on. It's a picture of a straight man me would like to be his lover, and he tells all his gay friends that it is. That's no more an assumption than saying its a friend, brother, etc. Why don't you just ask him
I know plenty of guys who have their friends as wallpaper. It's a reminder of a good time that the guy had with his friend. It might not be anything more. Just because the guy is gay doesn't mean that he has a crush on your man.