It sounds as though both of you realize that you have grown apart&aren't supposed to be together...staying together only for the sake of a child is not a good enough reason to be together...if the child sees that the both of you are unhappy, then the child will be unhappy...better to move on w/ your life despite the history...obviously the both of you are looking for other things or the both of you wouldn't have cheated...your son will be fine in the long run&so will the both of you...try to stay civil for your child's sake...I'd rather be alone&be happy, than with someone&be miserable...breaking up isn't easy but eventually you will be able to truly find what you are looking for then...I would talk w/ him...good luck!