Woman to Woman - Graham Cutts, Alfred Hitchcock

David Compton leaves his expecting French girl-friend Louise Boucher, a dancer at the Moulin Rouge, for the war where he looses his memory. Building a new life from scratch after the war, he gets married in London. Louise, now a mother, thinks him dead. She becomes a famous dancer under the name Deloryse but falls gravely ill. One night, as David is in the audience of her show, he recovers his memory. When she learns that David is married to another woman, Louise turns her son in the care of David's new wife and accepting a dancing job at a party, she dies there of exhaustion and sorrow.