Greensoul, addicts have a way of creeping into our lifes when we least expect it. They can turn on the charm, and tell us we were right to do this that and the other. My opinion is that this is just another form of manipulation. He is attempting to manipulate your emotions - using the nickname he had for you! To me, that has one aim, to play with your mind.
It can take a while for our emotions to get under control - especially when we were in love with a person.
Keep in your mind - "treating me like used toilet paper" you deserve better. It may be a plan to block the number he called you from. You are rebuilding your life without addiction contaminating it - keep moving forward!
Much Love
Bute x