It's not that I'm really mute, it's that no one speaks. There are many people alive in the wasteland, but most of them are not trustworthy. He has seen too many people stabbing you for half a bottle of water, and he has also seen people who called you brothers yesterday and sold you for food today. So for the past three years, he chose to live alone.
It's good to be alone. At least he won't get stabbed suddenly in the back.
