The solution? Mix it up. Try new things. Keep busy. Move your life forward. Let someone else break your heart. After all, new wounds help you forget old wounds. I slap mosquito bites for the very same reason (addressing bites directly with a scratch only makes the irritation worse). Fresh pain makes the old pain seem far less imminent and important. Before long, you forget the old pain ever existed.
With enough practice and endurance, you can learn to move on without inducing new pain. Mosquito bites go away faster if you ignore them entirely. How about a new adage? “Selective memory heals all wounds.”