By bending the hinge you have increased the internal resistance within the hinge so it keeps the door from moving as easily as before.
How to fix a door hinge that keeps closing.
How to fix a door that swings shut.
Remove the pin by placing a screwdriver under the middle hinge.
The door should no longer move itself.
Take a hammer and long nail and tap the pin gently from the highest hinge.
Work your way from the top of the door to the bottom.
If you have a really crooked frame and still need just a little more resistance remove another hinge pin and perform the same magic.
If a door binds open it grasp the knob and lift up to see if a hinge is loose.
Use a screwdriver to tighten the screws attaching the hinges to the door and the door frame.
Place a large nail or small screwdriver on the bottom of the center hinge pin of your door.
Tap the screwdriver with the hammer until the pin pops up from the hinge and can be removed by hand.
The easiest fix is to remove your middle hinge pin and put a slight bend in it.
If your door has only two hinges close.
If one is loose remove two or more screws and try driving in longer screws.
When i say slight that means a barely noticeable bend.
Tap it with a hammer forcing the nail out the top of the hinge.
Adjust the hinge to have it align correctly and snugly with the door and frame.
If not align the hinge knuckles and tap the pins.