I think its too complex a thing to really give a clear answer. Its all relative in the end and I don't believe its so much a matter of finding someone else to be happy with. I'm not going to lie and say its not lonely some of the time, but until we're mostly content with ourselves without a need to feel like we need someone else to be 'complete', I think that's when we project a certain confidence from within that lets others know that we'd be happy to be with someone else but know I don't need you to be 'complete'. Just happier.