"Not sure there is even a decision to make about allowing him back into my life. I may very well never hear from him again.". This could be a very good thing. A blessing in disguise. Yes, I was addicted. I really hope therapy helps you. You know, maybe this is just part of your story. It sounds like you want to push it away. And not feel the way you feel. And also like you shouldn't feel this way. But that's inaccurate. You feel how you feel. It is a process coming out of it, and you are in the beginning stages.

Google "person addiction.". It came up with some good stuff. There's a psych central article that comes up too.