So happy ever afters then? The classic ending for fairytales, usually but not always. Hans Christen Andersen proved with this with The Little Mermaid and The Little Match Girl in particular, which I guess I could describe as two of my favourite "weepies". But, again, the endings are apt for the way he wrote the characters and the situations he put them in and I think this is what we should aim for with our own stories. Sometimes a happy ending will be appropriate, sometimes it won't, sometimes the possibility of a happy ending to come beyond the life of the story is an apt way to finish, and sometimes a tragic solution is the only way to end the story.
So you need to ask yourself what would be the most appropriate finish for your story? Does it tie in with what we know of your characters? Does it have the maximum impact on your reader? The most important thing about endings is they have to be definite and definitive. Something about the ending must bring to a satisfactory conclusion what you have revealed about what your characters - this is where the "ring of tturh" to fiction comes in.
Do you find writing the endings to stories more difficult than the start? Comments welcome!