The way I see it there's only one guy he's about to cheat on. But I guess I do see ur point. He's cheating on the second guy by lying that he's not in a relationship, is that wut u mean? I mean it would be a whole other story if the other guy knew he was in a relationship but tried to pursue him anyway. Damn I would hate him. But I'm pretty sure that's gonna happen eventually (as it's the trend of most yaoi plots)... So really there's only guy he's cheating on, and that's his boyfriend.
what i meant was, in a sense, if he were to be in a relationship with the second guy then in that guy's perspective he would be cheated on as well. but you're right.
it's still doesn't change the fact that he lied om the both of them that makes them both victims for his own selfishness. (assuming that the second guy still wouldn't know)
they're both hot. god, please don't cheat on the both of them uke. the other one is a daddy and the other is a total wild heart. they both don't deserve it