People who talk big about revenge are usually still being controlled by the person they’re angry at.

Revenge keeps the other person in charge of your schedule. Your plans get shaped by them, your attention goes to them, and every hour spent rehearsing the moment is an hour they are still getting from you for free. The anger may be completely fair. What it is doing to your week is a separate question.

If someone has treated you badly, notice how much room they occupy in a normal day. Then take one thing back on purpose, something small and unrelated to them. Getting your attention back is slower than getting even, and it is the part that lasts.