Five easy steps
Step One-- Don't talk to him-- ever.
Step Two-- Don't respond to him-- ever.
Step Three-- Do not listen to or read anything he sends you-- ever.
Step Four-- Do not allow anybody who knows him to talk to you about him-- ever.
Step Five-- Practice Steps One through Four-- forever.
Cyranoak
P.s. Sometimes Step Four necessitates ending friendships and/or family relationships.