I Married a Monster from Outer Space (1958)

I Married a Monster from Outer Space is a 1958 American black-and-white science fiction film from Paramount Pictures, produced and directed by Gene Fowler Jr., that stars Tom Tryon and Gloria Talbott. Paramount released the film as a double feature with The Blob.

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The film's storyline concerns a young wife that begins to realize that her husband is not the man he was before they married. He has lost all real affection for her and for his new pet dog, which she gave him as a present. Thereafter, she quickly discovers that he is not the only man in town that appears to have changed. Now suspicious, she follows him one evening when he goes out for a walk and shockingly discovers that her husband is actually an alien humanoid.

For more info click on the link below:

https://en.wikipedia.org/wiki/I_Married_a_Monster_from_Outer_Space