Introverts are not quiet, they avoid conflict. They know you're wrong. How you're wrong. Why you're wrong. And the history & psychology of all your wrongs. They may stay quiet. You may think they gave up & you won. But trust me they planned the end even before you began thinking.
Introverts are attracted to authenticity. Good intentions. Kind hearts. People who don't judge but understand. People with whom they can laugh and cry and share silence. People who appreciate both their inner philosopher & the inner prankster. People who just get it.
If you ever hurt an introvert, they don't hold grudges, they just slowly drift away. Seen texts, missed calls, cancelled plans. They don't want to hurt you. So they just disappear. Quietly.