GG, I hope your thoughts about him possibly moving in the basement are correct, but try not to "assume" or have "expectations" about anything he says or does. He could very well be just cleaning up the area, i.e., wanting to get rid of things or put them in their proper places.
I know it's difficult for you to sit quietly and be still, but the answers will come and I do hate to see you trying to figure out what his moves will be. I don't want to see you hurt or disappointed when things don't turn out the way that you thought they might go.
GG, I know this is tough on you, but you've got to find a way to keep the focus on you and take care of yourself. I worry about you.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.