I can understand that you are hurting. I have been in a similar situation (only my ex did actually cheat) and it hurts like hell. You go through swings of emotions you cant understand because the love you bear for the person. You want to hate them with every ounce of your soul but cant.

The good news is he is taking the steps to seek help for his addictions. This alone shows that he has feelings and wants for the relationship just as you do. He wouldn't go that route if he didn't care about your marriage. I think that if you want the marriage to try and work, I suggest baby steps with caution to protect your own feelings. It may even do good to be separated for a little while so that he can work on his addiction. If you don't feel in your heart that you can ever forgive or trust him again, it might be best to let go. A relationship built on lies, deceit and hatred will only lead to more troubles.