There is nothing worse in a relationship than to find out that the person you love and thought you were going to spend the rest of your life with is being unfaithful. However, when it comes to the cheating itself, there are definitely levels of how bad the whole situation can get. So, as a thought exercise, let's grade these next cheating scenarios, 1 being the least bad, and 10 being the absolutely worst: If a partner cheats one year into a relationship with a complete stranger neither of you…