Was your "door-safety-strut" attached when this happened?
In your photo, notice that the inner door structure has been pulled away from the outer door skin, and essentially "pushed in" towards the center of the door.
This isn't a "tear" in the metal. The outer door skin is folded over and crimped to the inner door structure all around the perimeter, and a bead sealant is placed in the joint before final crimping.
Again looking at the photo, the area where the inner door structure has been separated from the door skin is only immediately around the lower hinge.
I think it's most likely that this was caused by a door that was opened beyond its normal range of travel, causing the lower hinge to be pressed "into" the door. The door strut is the only thing that prevents the door from being opened too far. It the door gets opened without the strut attached, and goes beyond its normal range of travel, there will likely be enough force to deform the inner structure, and pull it out of the folded-over crimp at the edge of the door skin.
There's really no easy way to "fix" this. Because the lower hinge attachment point at the door is now in the wrong location, the door won't close and latch properly. A really good body shop could probably remove the doorskin, straighten the inner door structure around the hinge, and install a new skin, but that might cost just as much as buying a complete new door.
Never remove the door-stop strut! If it gets damaged, replace it immediately.