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Energy stealer is a person who sucks all your energy with mean remarks, powerful ego or his/her personal problems. It's better to just avoid someone like this because the situation doesn't usually get better. I myself had to cut connections to an old friend when I realized that the "friendship" had more downsides than benefits and the situation was just getting worse over the years. It's better to leave these people behind or avoid them as much as possible and look for new people who give you strength and inspiration.