I've been inspired and/or intrigued by the cheating-and-revenge genre for a while. Some authors, like the late Xalir, did some of their best stories in the genre, in my opinion. The idea for "Things Get Better" has also been inspired by another genre: the one where the author takes a song title and writes a story to fit it.
I happened to be listening to some old soul music one day and heard the song, "Things Get Better" by Eddie Floyd. I had my title. Now for a story to fit it. Before something gets better it has to get worse, so I dropped my protagonist to the very bottom by having him discover his wife had cheated on him in the worst way: the birth of a child who's the wrong color. Since a double homicide in the maternity ward would leave his four-year-old daughter an orphan while he rotted in prison, he chooses another way to go forward, one without violent retribution.
There's no sex in this story. Our hapless protagonist doesn't even start a romance for twelve years. The revenge? Well, they do say the best revenge is living well...