What is love anyway?

This isnt a tip. Its a question. Who can really say what love is? No one. Is there really only 1 person meant for each person? Or is there several? What if you think you have met 'The One' and you get married, he dies in a year time and you then meet someone down the track that you get along just as well with? Love is nothing more than a feeling invented by religions to make sex sound less dirty if its involved. The rest of the feelings we experience are nothing but chemicals arent they?