It's unlikely to have snapped. It's a hefty handle.
More likely the mechanism has worked loose. There are two Allen bolts that can work loose which makes the handle floppy and inoperative.
Now for the fun bit. If you can't open the tailgate from the outside, you will need to remove the tailgate cover from the inside! It's not easy but apparently it can be done without too much damage. Then you can reach the two rods that operate the lock release (one either side).
I do have a spare handle but it's been trimmed for a 90 style light surround. I also have a spare inner tailgate cover if you damage yours. Good luck
