YR, Your h left that piece of aper for you to find. He wanted a reaction from you. Keep in mind that even through the very last stage which is not part of the usual steps, they will test you to see where your head, heart and soul are. So, yes, he was testing you this time around.
He may be thinking about moving out, but I wouldn't broach the subject w/him again. I would go about my own business and if he wants to sleep on the couch, so be it. Stay as calm as you can and observe for now.
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.
