What is LOVE

It's hard to go day by day knowing you've made a mistake. We don't want to hurt the ones we love, but how do we continue to do so? How can people be so hypocritical about themselves but not want that for the other person? Are we all not really happy when we say we are?  When we find that significant other, how do we do everything right? Is it possible to? When one makes a mistake how do you save your relationship? Do you begin to make sacrifices as they have done for you, are you suppose to cut out all possible bad things or people that could ruin what good you do have? Is that what love is about, if not then what is?