Some people whose tender hearts have been bruised at an early age, become hard-hearted and mean. While others chose to overcome this hurt and carry on; to feel all the little bumps in the road of life,--- they rise above it.
The hard-hearted need more understanding, patiences, and kindness from the ones who care. Sometimes, relationships that you have to work the hardest to develope, are the ones that last.
But on the same note: Never let anyone be abusive in a relationship--get out of it--if this happens--. And on a second note: If you have to work too hard at a relationship; it may not be worth it.
A good relationship involves: Love, Trust, Care, Kindness,
Consideration, and most of all Respect.
Respect means you honor that person, as well as they should honor you.
Why People Hurt Each Other? I don't really know, all the answers. But I believe it is ingorance from not being taught in a good family environment. And it is a waste of time. Life is time, and everyone's clock is ticking.
I, personally do not have time for mean people in my life. And that means even if they are family, friends or non-friends.
Good Luck in Your Life,