This is human nature, and there will always be this compulsion between the opposite sex. There is no need to bear too heavy a yoke for your feelings. This ambiguous feeling between you and her is the best. It is better to keep this state, just be better friends than ordinary friends, lend a helping hand when you are in trouble, and share it when you are happy. Once you break this state and become a lover, you will feel guilty, and then you will only be sad.
Why don't you enjoy your little secret love at work? After work, spend more time with your wife, tutor your children and enjoy your family. Don't ruin the beauty of the family. When things change, it's just a brief emotional episode in your life.