I was just having fun with a cliché drama plot Like I said, I don't actually think it fits here (mainly because I don't remember his mother being portrayed as that archetype)How did you reach that conclusion ^^;
I think the mangaka (or even author) was trying to make it obvious it was meant to be interpreted as something about cheating (potentially as a red herring), with all those cues about mc's reaction to a random coworker girl appearing and sudden flashback to a divorce that had nothing to do with anything, out of nowhere. If it was just a new post-divorce mother then mangaka wouldn't be leaning that heavily into making mc acting all (melo)dramatic about the coworker.At those scenes, the most likely thought people came to is what if Maki’s father was having an affair.
Even if it’s not an affair, it’s still something uncomfortable for Maki. It would feel like him and his mother is left behind, still stuck in the divorce. Making it worse is because his father is not wrong, everyone got the right to move on with their life.
Also Maki’s mom work long hours because she wants to raise Maki on her own after the divorce. She avoids using the child care money her divorced husband still send to them.
But as mc's flashback showed, he had absolutely no indication that the divorce had been because of such a thing. So no actual reason for him to suspect that unless he speculated wildly.
As for whether it's actually the case, or a red herring where mc erronously thinks it is, to artificially create boring drama? We won't know until story gets to addressing it.