He doesnt cheat.... he was just pretending to.
He was being insecure. That doesn't mean he wasn't cheating but you're wrong when you say he was cheating purely to be petty. Also, it doesn't look like they actually had sex. So I think you're the one who needs to read this a little more slowly. And don't accuse me of being biased. I think Nagao is a jerk who deserves to be punished exactly in the way you described.
I'm gonna rip that Nagao's dick into shreds. Just because the uke needs to work and hasn't been spending time with him, he cheats? Well ain't this fucker a bitch, the uke should've hit it on with one of the seme's friends to give him a taste of his own medicine.