This feeling is generally due to a past love that did't end by a marriage or being attracted by an other man during marriage.
1)Bear in mind that sometimes a woman loves someone and she thinks he is the best suitable person for her but in reality he is not ,he just a nice picture drawn in her mind but once being closer to him she 'll discover sooner or later that he didn't deserve they love and it was a big mistake to ruin her marriage for him.
2) Human beings are characterize by loving what in the others hands.But believe me to satisfied with what in you're your hands is the happiness itself.
3)Sometimes when we lose a person that loved us and we didn't valuate his/her love ,he/ will leave and never be back.
4)Love is something that can grow up or die ,it's up to us.Make the feelings of respect to your husband grow up until they'll be a real love.