There is much to say about your suggested tactic. The thought of just moving on is ripe with possibilities. While coming up far short of what makes for solid advice.

Your brief essay comes up short with both the possibilities and their intentions.

Gaslighting is a tactic. Hard stop. If you are in a relationship with a person using this tactic one can not simply follow your muses advice. The context is everything. Context creates strategy and hence, appropriate tactics. There lies the possibilities and therein the genuine intention.

Of course, a gaslighting narcissist is never a part of your long term relations other than daunting ones.

Thanks for listening.