Learn how to move past sadness and grief—it will help you in all areas of life.
Devastating things happen to everyone (if they live long enough). Nearly everyone is deeply affected by these things, but some people can acknowledge it, accept it and soon resume being happy and productive. Others detach and move on, which is less healthy. Then there are many who are consumed by it.
Just because fiction is fiction doesn't mean we can't be sad or grieve as if the characters are real people, our friends. Actually, reading fiction can help us prepare for what life throws at us—and writing maybe even moreso!
There are many ways to learn to respond in more healthy ways to sadness and grief. These include our upbringing, friends, self-help books, counselors, and good ol' learning-the-hard-way.
What is a healthy response for one person is not the same for another person. Some people need to "get it out of their system", some need to pay their respects over a long period, some need to find something new to fill the hole. But remember that grieving is wired into us humans, and sometimes it can't be sped up.
Personally I feel that the most powerful thing is one's philosophical outlook. In my case, "what do I prefer, a life of misery or a life of joy?" This guides me to pay less attention to the pain and more attention to achieving, enjoying, and learning.