What is the reason for overly sad movies like Fault/Stars?

[/quote]My Dog Skip got me. I wandered into the end of it on HBO Family the summer after my dog Orson had to be euthanized. Thus, I was vulnerable to animal tearjerkers like it.
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My neighbor wants to see my dog skip and I flat out refused to watch it. she is a humungous animal heartwarming movie/real life person as am I but she just doesn't understand why I refuse. I keep on telling her how I dislike these overly sad movies, especially if they are true stories because the real world is sad enough.