If you see a person or a "friend" that complements you too much - he might be giving you an Evil Eye. He might NOT be complementing you but rather engaging in flattery; flattery means he is JEALOUS of you and this results in the EVIL EYE.
The Zohar below WARNS us to stay away from these kind of people and whatever you do don't look them in the eye.
The Zohar continues, looking them in the eye invites the angel of death! How nice? Also the Zohar says elsewhere that 99% of people die from Evil Eye - learn to protect yourself