Extricating yourself from this different situation demands that you make a clear choice. You are in a very difficult and heart wrenching situation. No, you are not sick. Seeing your children happy when your husband is around and realizing that you cannot have a relationship with him when he has other women is a real dilemma, and we feel for you.
Unfortunately, we cannot tell you what is best for you. However, there are a few givens in your situations: 1 you can have your marriage declared null and void, but he remains to be the father of your children. Your kids need to have a relationship with him, whether you are together or apart. For any relationship to work, two people must continue to stay involved. If one decides to disengage, there can be no relationship no matter what the other person does. You have little or no control over your husband: at best, you can only make decisions for yourself.