Nice little revenge/second chance story. The H/h have been separated for 8 years. They married when poor little rich girl heroine was 19 and the other-side-of-the-tracks hero was building his construction empire. They broke up after a year when the heroine thought he was cheating with an OW.
The story opens in Bali, scene of the H/h's perfect honeymoon, where the heroine has gone to lick her wounds. For the past 8 years the heroine has helped her father with his business. When he died, heroine had to deal with everything herself. Now she's poised to go bankrupt.
Hero has followed her to Bali, sensing this is time for revenge. He will take over the business if she lives with him as his wife for three months. Heroine is horrified that she is still attracted to her husband, but she agrees.
From there we have a travelogue of Bali. Several treacherous body moments and lots of heavy hints that the hero never cheated on the heroine that first year, the heroine never cheated on the hero, and that the evil father was behind all of the misunderstandings.
But before the H/h can have their HEA, an OW-in-training shows up. Her lies are so clumsily told (and easily disproved) that it's hard to believe the heroine would fall for them. Eventually the OW is found out and she is fired. I'm sure this OW will do better next time - she's young and she has to learn to avoid the comeuppance as the most skillful of OWs of HPlandia.
H/h both wanted the other to think they had had affairs. But the heroine never had sex with anyone but the hero. Hero did have sexual affairs about three years into their separation, but eventually tapered off to celibacy. He was still hung up in the heroine.
The hero is cruel at first, but there are plenty of scenes where the H/h get along beautifully and/or the hero shows his affection/tenderness for the heroine. So the HEA feels right.