Need?

Why do we have an incessant need of being needed? Or is it just me? i've often wondered , someone like who enjoys their own company the most still craves being liked and wanted by everyone else. It's more got to do with control issues of needs and being needed than love or like for someone?
Yet i fail to put across a simple line forward when someone comes and hurts me right in the face and move on pretending nothing ever happened. No, i cannot go on like this from now. I - deserve an explanation and answers for things i never did (or at least i think so). Does every relationship have an end? Be it friendship, family your old school mates, uni mates, best friends? We often fall out for reasons unknown and mostly because neither of the people ever felt the need to 'sort it out'. We accept silence as the answer. We accept non confrontation as normal, we accept ego as self respect. But is self respect worth someone's hurt? Is moving on always the answer? Knowing in your heart, you had a chance and yet you know there is nothing you can really do about it. In situations like these I wonder, how useful the term 'life is short' really is? Because sometimes if you bother, more often it would be the other does not even care enough. I'm pressing myself so hard not too care too much, but i fail, for i care. I care because i deserve an explanation, I care because i just care. Is that reason enough?
The dilemma i am really caught in right now is what would 'normal' really be? What have we as a society as humans accepeted as normal is REALLY NORMAL. Is this how things usually end? One fine day your friend wakes up and decides to hurt you like a bitch and its over.