There is an infinite feeling in the world. It will never fade away, or get less valuable or anything. It is to love someone. I am not saying this because I am a lover or something, because it could be your friend your parents you show your love to, as well. In this cruel world all of us suffer from something that we consider as unfair, and love is a tool for everyone to keep it up.
I think it turns into a missing feeling after a while of not being with somebody. The mind, body, everything needs you to just be with someone.