Many people have gotten into trouble by being friendly with unhappy people; both become miserable. It is like a doctor going to a patient who is sick, and the doctor also becomes sick.
If the doctor also thinks, 'How can I alone be healthy? Let me also share the patient's misery', then who will help the patient then?
So, what should be the attitude with people who are miserable? Compassion, not pity.

Sri Sri Ravi Shankar