In real life there's nothing better than happiness, but in fiction nothing will kill your story quicker. Conflict, a little tragedy, a bit of jealousy, a helping of anger...that's what will keep people reading what you write. A happily-ever-after ending is fine but it only works if your hero/heroine has gone through hell and back to get there.
Here's an excellent post to help you learn how to write conflict from one of my new favorite writing sites, Live Write Thrive.
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