What is this word 'LOVE' people keep throwing around?

She just came into my life out of nowhere, you know? My world was dark. No future, no way out. No light. But then she came. Suddenly I had a reason. She ain't even have to try; she just somehow found a way into my heart. She was my purpose. She was my light. She was so pure, so untainted by the horrors of this world; the complete opposite of me. I was meant to be alone. I knew then I didn't deserve her. But fuck it. She was the one.