They shower you with compliments that somehow feel like insults. It's like a sugarcoated dagger.
Every accomplishment of yours is met with a dose of negativity or a comparison to their own life.
They frequently compare themselves to you, turning everything into a competition to feel superior.
They start dressing like you, talking like you, and even dating the same type of people
Being around them drains you, as they constantly bring the mood down.
They leave you out of social gatherings and activities, making you feel isolated and unimportant.
They spread rumors or gossip about you, trying to damage your reputation behind your back.
They disappear when good things happen to you, only to reappear when they need something.