How does one do it? How does one truly heal?

The love bombing, the game playing and trickery, the gaslighting, the manipulation, the severe abuse, the eventual discard with no apology, no ownership and zero remorse. The despicable utterly viciously harmful things that were said that should never be said. The atrociousness of it all.

How does one truly heal and get past it all?

How does one stop needing and wanting sweet revenge for the pain that was inflicted?