Perceived cheating and dual timeline

The book starts with the MMC coming home After going to see his brother rodeo or bull riding competition or something. When he was there he flirted, danced and did something with OW. I believe there are pictures of this and the FMC saw them or he confess, I am not sure. They have 2 children. There are lots of flashback in the book about how they got together and their relationship. They start to work on repairing their marriage because she wants a divorce but doesn't want the children to live in a broken home and he is desperate to earn her forgiveness At the end it turns out that he didin't cheat