I agree with the others that you sound put together and calm. Good for you!
On my thread I also describe my DH coming to the house "sneaking his stuff out". I hated it. I asked him to respect my boundaries.Hmm.
After he filed for D then I changed the locks. I couldn't stand him coming in and taking stuff. I know it's our stuff and he and I should have every right to the items but gee whiz- let's talk about it.
I tried to be open and have conversations with my DH at the beginning and all I got was deflected eye contact. No conversations about anything. He was and is weird.
I offered him to come over and I'd even make dinner for him and the children and I'd leave. Nope. He didn't want to be here. Our home is too much of a reminder of responsibility and the life he doesn't want. So for you to be nice - hmmm...just be careful. They are in a weird place. Take care of yourself and your S. Have fun at Legoland!!