It might be a bit similar to my predilection for certain books. I hadn't really thought about it till recently, but many of my favourite novels have a similar theme - a focal character, often young, going through some sort of rejection and then having a happy ending. My therapist said it made sense that I would try and find a pleasant resolution to difficult things if I had never had such a resolution in my own life. So it kind of fits with what Silent Tears 17 put.
At the moment I can't cope with a lot of things such as violence or disaster on TV - I either turn it off or tell myself out loud, over and over again, that it's fiction and they are just actors on a TV show. Just as well I rarely watch with anyone else, really.
Hope that is some use, anyway.

Bluegrey