Never search your happiness in others, it will make you feel alone. Search it in yourself, you will feel happy even when you are left alone.
Feeling lonely is one of the worst emotional situations we know of. After you take care of your physical needs (food, shelter and security), the need for friendship can only grow bigger.
Being alone, not having someone to share your worries and hopes with, makes you feel a certain kind of emptiness. It’s actually natural for your body to make you feel that way: our physiology is designed to push us to go and socialize, and stay CLOSE to people.