the universe is filled with happy accidents, surprises and unpredictability.
nature is created out of a sum of many tiny pulsating objects that we now know as patterns; and it doesn't matter how accurate ones calculation may seem, so long as we're dealing with nature, it remains unpredictable.
everything runs on a vicious cycle, we find/do something that makes us happy for a moment then find something that makes us sad or lonely again; it's all order and chaos.
i should add that there's so much to be grateful about chaos, because what’s the point of dreaming if we knew exactly when our dreams would come true?