No offence - That's why I say you are 'naive'. Life is not that simple.
It is your 'naive' thinking that makes you happy with this relationship. However, you don't know what deteriments this relationship will cause to other people, such as the ones that love you - your husband; and the ones that you love - your children. Switch your focus back to your family. Don't concentrate always on thing that this relationship is bring you a lot of happiness.
Women always cherishes 'feeling in love'. My wife always complains that, being her spouse, I can't deliver her this feeling. It is lucky that she is not placing too much emphasize on this, or there will be another Ms. S.