Curse to Destroy Sex Drive/Romantic Endeavors

So long story short, a friend of mine is trying to get this asshole out of her life who keeps starting shit with their friend group. This guy seems to be hopping from person to person in relationships and then starting shit when it ends; a real piece of work.

Since he can’t have a relationship without starting shit, and hurting people, I say he doesn’t deserve a romantic or sex life.

Anyone got any tips or rituals that could bring this result?