via Stephanie A. Sarkis, Ph.D., Psychology Today:
Life in the aftermath of a gaslighting or narcissistic relationship can be a struggle. You may have left the relationship with wounds to your heart and self-esteem. If the gaslighter/narcissist left you for someone else, you may be feeling rage and betrayal. You may also be pretty mean to yourself, blaming yourself for things that are not your fault. If you find yourself in this situation, read on for how to help your healing process. If you are in the stages of leaving a gaslighter/narcissist, I encourage you to read How to Leave a Narcissist for Good.
It is important to block all forms of contact with the gaslighter/narcissist. This means blocking any emails or phone numbers. It also means letting friends and family know that you will not be entertaining any messages sent from the gaslighter/narcissist through them.