He won't leave me alone

This is the constant cycle: he imessages me on a new email or creates a new facebook account; I reply because I feel bad; I start to feel suicidal and depressed again; I block him after a few messages are exchanged; a few days later he iMessages me on a new email or creates a new facebook account. For example a week ago he created a new account and messaged me saying he had moved on and wants nothing more than to leave me alone but just wanted to make sure I'm okay. I replied that I was hurt by that and it turned into a little argument. I blocked him. Just stuff like that. He popped up again yesterday with a new iMessage and idk what it does to me, I feel so suicidal. I don't want to be here. When will this end I'm tired. The irony is I reply but if I don't reply I would feel guilty for not replying and he'd message me again being mean which would hurt me. There's no escape ive blocked him so many times and asked him to please leave me alone. Honestly I'm so tired of this, emotional abuse. He's been acting all nice this time and it's confusing. I don't know what he wants, I'm FED UP