I am so sorry for all that you are going through.
He isn't going to block you. Addicts are selfish and somewhere in the back of his mind I'm sure he's certain he may need or want something from you later.
Please block him. Please save yourself. I promise you'll get through this.
You could always look at it this way...blocking him really isn't permanent. If you REALLY wanted to, you could unblock him later.