People create the reality they need in order to discover themselves. Mark was someone who never got to discover himself. The people around him told him what he was and he couldn't deny it. Even though his heart wanted to. He was afraid of being who they wanted him to be, so he let them see what they wanted until they couldn't anymore and his life would fade away like a feather in the wind. Just to let them see he was a good person, with an open heart.