Looking for a movie 60's - 70's alter-ego, kid napping, cane, limp

Hi my movie is old between the 50's-60's it's about a man who marries his bosses daughter, she is a princess and he has no sex life with her, until he assumes an alternate identiy ( takes a cane, walks with a limp acts like a hard ass) sleeps with a prostitue and learns about love and life. He then kidnaps himself and his wife falls in love with his alter ego and wants him to stay gone....the movie ends in the sewer system. His wife is also has a room with many mirrors in their house for her ballet practice. Thank you so much for you help

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