Loneliness is an emotion we will all feel at some point in our lives. It is an unwanted emotion that can have many teeter on the edge of depression. But recent research suggests that loneliness has a real purpose, one that is quite beneficial.
Basically, loneliness is a defence mechanism that helps to protect us and keep us from harm. It works much in the same way as an immune system, and does so without you really knowing that it's being helpful.
Of course, as any other human emotion, loneliness is complicated. But it does, at some point, serve a purpose.