There seems to be two camps in regards to the reaction of cheating.

Camp one:
The people who have cheated on their significant others and sympathize with the "pain" that the person who committed the cheating is going through.

Camp two:
The people who would never cheat on their significant other and have no sympathy for the other party.

Camp one, also known as the weak and pathetic.

Camp two, also known and the strong and uncompramising.

My bias regarding this matter is immediate and open. When individuals compramise their moral structure in order for immediate personal satisfaction they lose all sense of integrity and any hope of defending their moral code.