Hello, takecare1, and welcome to Psych Central! I am thinking that you might need some romance/fun back into your marriage and your life in general. If you can get back into your relationship with your husband, then maybe you won't feel the need to fantasize about that guy so much.
Do you and your husband still "date" sometimes--such as going out to dinner and to a movie? Are you still doing nice things for each other, like maybe when you were dating?
This idea is the first possibility that comes into my mind anyway.