I hope I don't regret replying on this thread, with all the hostility here, but anyways:
After awhile of talking, we came to the agreement that he would hold onto my stuff incase I was going to return
ROFL "hold this 18M, dont spend it" HAHA, are you KIDDING ME? In what fantasy land does that happen? I want to vacation there one day, maybe in the springtime when its warmer.
If someone asks you to hold onto something in case they don't return, I do not believe that means: Go put it in the AH now and spend the Gil.
At least give the guy some time to decide if he will come back or not.
It's forward thinking to do an action like this, give away your stuff to a friend, in the event that you don't come back. That way it isn't lost on your character for ever. But it's not very 'honest' if this friend promises to hold it for you, then runs off to sell and spend the gil.
Not sure if this would quality as 'theft' or such, but it definately is dishonest.
I've had people who were leaving the game, give me stuff. I'd argue to try to get them to stay, but if they were persistent in leaving, I would take the stuff and promise to return it when they come back (hoping that they will). And to this day, I've never sold any of that stuff. Despite the fact that I would need gil. And when some of them come back, I am glad to give them the item back (the fact that a friend returns to the game, is worth way more then any gil I could get for all the items in Vana'diel). Even when they don't want it back, I still hold on to it for them :)
To the OP, you will simply have to accept the fact that you have run into someone who is less then honest in their promises to you. Hopefully in the future, if you have to do something similiar, you will do it with someone who can be more trusted and honest.