That is great for you to understand that you may have have been holding yourself back from the simple pleasure and value of having friends, just for the sake of having friends. Companionship.
It does not mean that you always have to go out and make small talk. There's no obligation to always do things with friends.
On his stuff in the garage and being "OK" with it being there and otherwise worrying that if you tell him to get his stuff out of the garage, you might chase him further away.
It is a funny thing about human nature. We have a tendency to want what we can't have. So when a WAS begins to see a LBS who is moving on with their life, they have a tendency to become curious and may actually start pursuing.
While that may be true, it is not something that you want to test. Moving on without the WAS is basically LRT. And what that means is, you are ultimately OK with getting D. You certainly can do LRT at some later point, if you are finally done.
In the mean time, you are having a lot of contact and your H has reasons to visit. If access to the house is not a concern for you and his stuff in the garage is not in your way, then certainly it IS ok to leave those things as they are.
What are some other GAL activities that you are planning on doing? Any new 180s you have planned? like... meeting new people and making new friends?