Sa akin ang asawa mo (1992) aka Your Wife is Mine
1992A poor stable boy cuckolds his rich boss twice by screwing his first wife and then later his second wife.
cheats with boyfriend’s boss
La peccatrice (1975) aka The Sinner
1975A black beauty cheats on her boyfriend with the rich owner of the mine that he’s working at, and then she cheats on the mine owner with his son.