Loathing was a strong word, but loathe your ex you did. At the end of the day, you were desperate. They were likely dangerous. You couldn't sit by and not do anything. You couldn't go to the authorities considering you didn't have any cold, hard proof, but...
People accidentally cursed themselves in odd ways every day. Drink to much carbonation, someone might float up into the atmosphere. Hit an animal on the road by accident and someone might sprout a tail. It was little things.
So what if you cursed them with something big, in more ways than one...?
It wasn't hard to find a curse you liked for the asshole, and the way it was written certainly sounded appealing. Fat tissue swells at a rate that leaves your victim thousands of pounds heavier in the span of mere minutes. It was perfect.
So you sat down, said what you needed to, performed the actions demanded, and all that was left was binding the seal. A simple chant. All you had to do was repeat 'big as a boulder' three times.
It was all almost over.