You could go the "tough love" route and prevent him from access to the house / yard without permission by you.
You could also just let him have free access.
The question is, what do YOU want?
If you have not picked up the book "Divorce Remedy" and read it, please do so as soon as possible. We use that as our frame of reference, here. It is almost like a workbook, if you will. The support you get her will often reference the book.
You will be on moderation which means that your posts will need to be reviewed and approved before they show up. Using this site to journal and ask questions in a series of posts will help get you off moderation, fairly quickly.
Looking at your info, your H's surgery could be a trigger to a situation where your H might be feeling he needs to get out and experience the world.
Can you let us know what you think led your H's decision to move out? Did you give you any reasons?
