Chained.

Richard, a millionaire in love with his secretary, Diane, is dispirited when his wife refuses to divorce him. Concerned that Diane will now lose interest, Richard offers her an all-expense-paid cruise to Argentina so that she can think it over. While traveling, however, Diane falls in love with fellow traveler Mike. She resolves to come clean to Richard, but upon return she becomes conflicted when she finds out he was able to get divorced after all.