Why are some people lonely? Why do they consume their minds and time with finding a partner? There is a huge difference between my friends who are afflicted with loneliness and my friends who have peace.
Those who dwell on their lonely situations induce their own anxiety. They focus on what could be if they had someone, dreadfully unaware of what they have in themselves and in those around them.
Perhaps they don't enjoy being alone and confuse being alone with loneliness. Perhaps they don't like to be with themselves. I think that is the key to why people feel lonely. Myself, I love the time I have alone. I get to do exactly what I want to do. I can be still and quiet and enjoy a good book or I could go out and enjoy an activity with friends.
It's what you want to make of it.