Hi Eban,
Thank you for your post and welcome to the family!

This is indeed a difficulty many of us face - how to have physical and emotional intimacy with partners whom we have such histories with. I know I have struggled with this as well at times.
Are you willing to have some intimacy with your partner or is that no longer possible for you? Is him having treatment totally necessary for you to continue in the relationship or are the changes you have made enough to make it possible to have some form of a relationship?