Since ages, very many sages and saints, astrologers and philosophers, authors and poets, and nature tried to define the word 'love', the definition changed time to time. The best part is, we till date could not actually abide by a single definition.
Love is a rational emotion...
Human beings are capable of love when they are willing. Unfortunately, we want to export everything that is beautiful in our life to heaven and live wantonly on this planet. Love, joy, blissfulness – these are human possibilities.
A simple process Love is not something to do with someone else. Love is never between two people. It is something that happens within you, and what happens within you need not be enslaved to someone else. For 15 to 20 minutes daily, go sit with something that means nothing to you – may be a tree, or a pebble, or a worm or an insect. After some time, you will find you can look upon it with as much love as you do your wife or husband or your mother or your child. Maybe the worm does not know this. That doesn’t matter. If you can look at everything lovingly, the whole world becomes beautiful in your experience. You realize love is not something that you do; love is the way you are.