Can't sympathize with Susan's loneliness

When Mike was in a coma and Ian was showing interest. I know you never really know what you'd do until you're in a similiar situation, and we've all had moral slips in our lives. If she really loved Mike, in a not selfish way, she would have politely declined Ian's requests. It was so uncomfortable for me. All of the cheating plot lines are. I know I'm probably stating the obvious but I just watched the episode where they go to the country and it just felt so wrong. Their entire relationship was wrong. & Edie and Mike COULD have been a cute couple. Susan has major main character energy in so many ways, I just can't get on board with rooting for her "happiness".