Brought me to tears...my kids are wondering what's wrong with me! It truly is a beautiful video. I can tell that you love him dearly. Now, to answer the question...what do you do with him now? He's a young horse that still needs love, support, and a great home. You give him that! Pure and simple.
UPDATE: We have found a GREAT family (they have a girlfriend for him too, her name is linda - she's a paint pony! And really cute!) who are going to take him on a 6month lease. He would be their trail horse. And after the 6months (they probably will since they will have bonded) buy him! Yay! I couldn't be happier with the situation, I am so happy for him... and he will get to do what he loves.... GRAZE!