I am so sorry JellyBean!!!!!! **HUGS** I know how hard it is, I got attached to Nelson before he was mine, and whenever his previous owner would tell me that potential buyers were coming to try him out, I'd get this huge lump in my throat and sick to my tummy.
Is there anyway that your parents can buy JJ for you??? Or can you do a lease program where the contract states that JJ cannot be sold out from under you?
I wish there were someting I could do for you, but keep in mind - what is meant to happen will happen. Maybe JJ taught you everything he needed to give to you, and it is his time to move on to give another fortunate kid what they need to learn.
Maybe your next fabulous mount, is now ready for you and is waiting for you to find him/her -
Just food for thought. Keep your chin up!