I feel sorry for the other guy. He's being used. Instead of the uke getting over one hit, one, he wasn't abused, he was hit once. The seme was upset about it and the broke up because of it right after. He left because he felt bad about it and would rather stay away. But no the ex gets a new boyfriend, and then they both go looking for the seme because he hit him once, only to have the shit beat out of him.
Yet the uke was there, watching, and didn't stop this even though he didn't like violence, and then crys about it. I'm sorry but what the hell?
In most cases he's using the new boyfriend. If he's not that's fine, I'm wrong, but so help me, in my theory does happen, I'm gonna be pissed.
So our hero hit his first love and it ended things. They don't see each other for half a year, half a year after it ended, and his ex shows up with a stronger boyfriend who beats the shit out of the guy.
It's totally clear that the little bitch uke is only using the new boyfriend and only wants the hero to take him back!
That's it!
That's why I have no doubt that once our hero and master are truly happy, the little bitch will come back and cause all sorts of shit to happen.
So help me if this does happen I hope master is the one the beats the shit out of him! That will be glorious!