This is a difficult situation you are in, but let's examine what's going on here. If you were to leave your husband for this man, would you be able to trust that he would not have an emotional affair with someone else down the line? Cheating is often a patterned behavior.
If I were in your position, I would take two weeks of breaking off contact with your supervisor. I would reevaluate how I feel after taking that time off, and within those two weeks, I would do my best to rekindle the relationship I have with my husband.
After two weeks, you may find that the idea of an affair with the supervisor does not hit as hard as it does now and that you are happy you refrained from it. Good luck.
I did what you asked and we spent some time apart. We talked and realized that we are indeed in love with each other and this is not a sex thing. We both have feelings for each other but we know its impossible to be together because we work together and have very different lives. We cant stop thinking about each other. What can we do??