We live in society, we live for society. Therefore social life is also equally important along with the personal life.
Why do you want to have a luxury car? because luxury is defined by the society. Why do you follow fashion trends? because people around you are watching you. So if you are living in the society you behave like society decides. You follow the culture of the some or other society then there has to be importance for social life. Because that society always be there in your ups and downs.
Social Groups provide us with an important part of our identity, and more than that, they teach us a set of skills that help us to live our lives.
Social connections are an important source of fun, pleasure, sense of security, and support, all of which play into maintaining good physical and emotional health.