If you feel that you can trust him, then by all means work w/him concerning the boat. I do hope that he can sell it sometime in the near future so that this will be one more thing that has been completed and your name cleared off of it.
Keep your emotions in check when you call him. Again, this is another business deal and you will do better if you remember this when communicating w/him.
Good luck!
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.