DEAR ABBY: My wife and I were married 21 years ago. Since then, she has admitted to cheating with 10 different men. Each time, I stayed with her, hoping she’d change. I finally left 3 1/2 years ago because I couldn’t take it anymore. She became homeless, but for the past year and a half she has been living with my daughter and me because I saw her on the street one day and she looked terrible.