I may be smacked here...but he should be the one thanking you for allowing him to visit w/you. You've allowed him to stay at the house and most likely you've done the cooking, laundry, etc. for him.

If you feel the need to do something, send him a text after he arrives back to his home and just say it was nice to see you again and leave it at that. That man doesn't appreciate you and after him saying he still doesn't want to be married...nope...I wouldn't be thanking him at all. Now, if he left you a golden egg under your pillow as a tip...then yes.

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.