Steel magnate John Thornley has been in love with showgirl Doree Macy for years. When he learns she is in New York with a play, he invites her to a party on his yacht. He also brings along his partner, Robert Byrne, who agrees to come on the condition that he can bring his work with him. John sends Doree in to tempt Bob away from his work. He refuses, but the next morning, joins her for a swim. By the end of the weekend, Doree has fallen in love with Bob, who is married, but explains that he and his wife have an “understanding.” Although she is afraid that he is only playing around while his wife is gone, Doree begins an affair with him. Then, one day, she finds a telegram from Bob’s wife Consuelo announcing her return. He admits that although he will always love Doree, he is still committed to his marriage. Bob tries to renew his relationship with Consuelo, but she tells him that she doesn’t love him in a physical way and wants a divorce. Bob immediately cables the yacht where John has taken Doree to get over the affair but Doree turns him away. In response, John offers to help her get over Bob, even though he knows she doesn’t love him. Back in the city, John learns that Bob is getting divorced and sends him off to tell Doree. Bob steps aside, however, when he discovers John’s love for her. To save Doree from a nervous breakdown, John takes her to Europe on his yacht. Unknown to Doree, Bob is in France, trying to forget her. John arranges for the two to meet and then sails away leaving the two of them together. More on Wikipedia
Watch My Past a.k.a. Ex-Mistress (1931)