Can we do without this thing called Love?

What is it about love that makes us so irrational, do things we won't usually do?
What is it about love that makes us keep reliving days gone by?
What is it about love that makes us unable to forget and to blank out the past?
What is it about love that makes us wish and wish for the One to always be by your side?
What is it about love that makes us forgive and accept faults?
What is it about love that makes us want to show our best side to them?
What is it about love that makes us feel oh so jealous at the slightest chance?
What is it about love that makes us feel so contented, so blissful?
What is it about love that makes us want to care for a person forever?
What is it about love that makes us unable to let go of memories of the past?
What is it about love that makes us never give up the feeling that we could be together again?
What is it about love that makes us change our ways?

I have this many questions! Anyone wants to help me answer them?