Ask yourself a hypothetical question.
Let's say you two ended up together. Then 5 years down the track you ended up in the same situation you are in now, nil emotions, I love you's, sex every few months, because the fire of excitement, lust, hiding, sneaking is no longer there.
Would you wonder if you could have captured all of this "again" with your Husband and maybe made a mistake?
We always want what we can't have.
Take 5 out and go back to when you met your husband, if you can't see a simular pattern lust, falling in love, perhaps you settled, if you can see it was simular maybe not as passionate then look ahead a few years and ask that question whether this relationship could end up the same.
Adventure, excitement, compliments doesn't last forever unless you are with the person that is prepared to never stop being that way, because of your and his love for each other.
I've recalled 1 only in 9 years of Forums, where he has in fact left his wife and children for his Mistress.
Ask yourself one more question, if it didn't work out with you two, would he have another affair with another younger woman...............