I mostly skimmed but here's the gist of it. The ex can't let her go so he sends you, the husband, revenge porn when they were still dating in the past. Husband received a mail (dvd of revenge porn) but in the first playthrough, there is no second choice to watch the dvd immediately, just watch it later. Husband just brushed it off and watched it days, weeks(?) later, but by then it's too late. Your wife is fucking the ex again and he sends you their latest sex videos. Near the end of the game, ex shows up inside your house, reveals it all, that he's sending you their porn to the wife's shock, then they fuck. Reload the save and there would be a second choice to watch the revenge porn immediately, which will allow the husband to talk to the wife about it. Then there will be two choices, divorce her or stay with her. Stay with her, you get lovey dovey sex. Divorce her, you leave her alone in the room, she screams, runs out of the house, saw her ex and gets tilted, screaming at him saying it's all his fault. The end.
You then can get the wife pov if you play the game again from start. I didn't play the wife pov so I don't know what prompt the wife to fuck the ex again in the first playthrough when you don't watch the revenge porn immediately.
Her short hair cg is her past look. Long hair is the present.