Let him get his own stuff! You don't have to do his packing for him! Just don't try to stop him if he's made up his mind to do it.
If this is what he wants, he's gonna do it...amicably or not. That is what you must understand. You can't stop him.
You can't control what he does or doesn't do...so don't bother. You're not "giving in"...you'll be showing him that although this is not what you want, you're gonna be fine if he goes through with it. That's showing strength.
"Always go straight forward, and if you meet the devil, cut him in two and go between the pieces." - William Sturgis, clipper ship captain, 1830's.