Lupe Marin was Rivera's wife prior to his marriage to Kahlo. Initially, Marin didn't like Kahlo and accused her of being a heavy drinker. Over time, however, Marin found herself as captivated by Kahlo as the man who divorced her for the younger woman. Marin even took the time to teach Frida how to be a more successful wife for her ex.
Frida, a Biography of Frida Kahlo