I know the jk fuck (I'm not gonna bother learning his name) is the son of someone important, but lemme guess, ichijo is the daughter of someone more important?
It believe gonna go one of a few ways, the ex's mom is gonna see MC woth another girl, assume hes cheating and confront him to find out its the opposite, MCs mom will have tea with ex's mom and tell her in passing about the situation, or the scum will ditch her and the ex will have nobody to...