Companion for life... ???

What is the need for companionship? Why does one get this feeling that they need a "companion"? What is that special thing that this "companion" can give that a friend cant? What do we expect out of this companion? What sort of relationship is expected? Is it physical? Is it sex? But you don't need a companion to have sex. Then why do we need a companion?
I have never had a girlfriend or never have I been in love. I have never been sorry or felt that I have missed out on anything...... yet. But off late, I have started to feel, I might have missed out on something. Why have I got this feeling now? What has changed in me? What do I expect? What exactly have I lost by not being in love? Is it my age? What happens at this age? I can understand the need/craving for sex or bodily pleasures. But this is something else. This is not just physical pleasure. This is something else. Need for a companion. What do I expect out of this companion? If it is not physical pleasure then cant I get this need for a companion satisfied by a friend? It isn't like there is a person whom I want to be with. There is no one. I just want someone. Why is this? What do I crave? I cant think of what I want to do with this "companion", then what do I need a "companion" for? What sort of confused state of mind is this?

I guess this is what love is. I guess I will get the answers to my questions when I do meet this "companion" and get to spend my life with her.

Hope I find the answers to my questions soon. :)