Difference between dependence, liabiity and independence

We are all social creatures. Not a single entity in the universe, whether it be a blade of grass or a street dog or a man in society can live fully independent. It is also true that not a single entity can give all of the necessities of another entity, whether it is a man-woman, father-son or friend-friend relationship. Good relationships and I mean relationships that everyone expects to succeed, like in the movies or the novels, the ones with the tag '...and they happily lived ever after.' break-up for this reason only. There is no inherent error in the participants because whatever the lapses are could be forgiven with some understanding. But then, the participants expect more and more from each other and this then leads the relationship to become a liability. One drops the other in horror because he or she knows that the needs cannot be fulfilled alone. But since one is bound by the vows taken when the relationship started, one goes on only as long as the basic commitments are met, like for example in a marriage, paying whatever alimony. After that comes independence, but even here caution is needed because it's impossibly difficult to live a lonely life. So one still interacts with those related before but this time one looks into the self that is beneath their exterior. Such a self may look a little boring or bland or imperceptible, but it is nevertheless there and it is the only one with which one can truly bond. There is freedom and ease in loving such a self because it doesn't make any demands, being self-content. This is what people say as detached love.