I think it is quite normal to have feelings and/or curiosities, but I agree with Gayle, if you are married do you not love your husband? Does he not love you? I know that I love my wife more than any other women out there, but that doesn't mean that I don't find others attractive, or think about times in the past. Because you never really dated or were in a serious relationship with this other man, you have filled in the gaps with assumptions about how the two of you would be together if you were or could. The assumptions you make will almost always be rosier than the reality.

I do believe it is possible to have feelings for more than one person, definitely, but you have to ask yourself, how would you feel if your husband loved another woman more than you?

My suggestion is to love your husband, unless there is some other reason not to, then you should confront him and tell him the truth.... otherwise just keep it to yourself and move forward. DO NOT SLEEP with this other guy!