What does the sentence "I healed the scar and forgot the pain" mean?

The phrase "the scar forgets the pain" means that after the wound heals, you will forget how painful it is. Human beings will have such problems both psychologically and physically, and they will always forget their initial feelings because of the passage of time.

Especially in love, it is clear that the other party has made himself suffer for so long, but after he heals the injury, as long as the other party gives himself a candy to eat, he will completely forget his pain and accept the other party again. I think this kind of behavior is torturing myself. Don't "forget the pain after healing the scar".