From the Wiki article entitled "Loneliness"

American Buddhist monk Ajahn Sumedho taught: "We suffer a lot in our society from loneliness. So much of our life is an attempt to not be lonely: 'Let's talk to each other; let's do things together so we won't be lonely.' And yet inevitably, we are really alone in these human forms. We can pretend; we can entertain each other; but that's about the best we can do. When it comes to the actual experience of life, we're very much alone; and to expect anyone else to take away our loneliness is asking too much."