Yep, the MLC parade will continue even after H moves back in. You can learn to live with him as a "housemate" not H. He's on his own journey and figuring out his chit.
He sees you as the lighthouse where he can come back to from time to time. You are the rock and steady force in all of this craziness. If you would, you'll find that LBS have handled a live-in MLCer....ForeverYoung, TSquared come to mind at the moment.
Again, you can look to Raine's posts for inspiration. Keep going baby...don't let H's crazymaking talks and actions throw you off course.
Enjoy your retreat with your girlfriend! Relax and take the focus off from H.