From the Mayo Clinic
What are the benefits of friendships?
Good friends are good for your health. Friends can help you celebrate good times and provide support during bad times. Friends prevent loneliness and give you a chance to offer needed companionship, too. Friends can also:
Increase your sense of belonging and purpose
Boost your happiness
Improve your self-worth
Help you cope with traumas, such as divorce, serious illness, job loss or the death of a loved one
Encourage you to change or avoid unhealthy lifestyle habits, such as excessive drinking or lack of exercise
Friends are fun to chase, share a bowl of food, and enjoy a lazy Sunday laying on the porch.