i think that cheating can best be described as (from a the point of view of someone who has been cheated on):like going to the doctor. and this doctor did something that really really hurt you, and something you will never forget. even though the doctor said nothing like this would happen again, each time you go, you get nervous and worry that the pain will reoccur.
take the doctor as the person that cheated, and hurt you. and each time you go to the doctor, as a time that the person could cheat on you again...