Melancholy Ending

A Wild Sheep Chase was my first full experience with Haruki Murakami's work.  After finishing the book I am unsure about my feelings towards the ending.  Boku's girlfriend leaves him and her special ear power is taken away.  On top of that the friend Boku was looking for turned out to be dead.  Boku is a hard boiled character and is unfazed by these things but the ending is still slightly depressing.  Despite Boku being fine I am left in a damper mood.  I have never read any other novels by Murakami and it makes me wonder if Murakami's other works also have a melancholy ending.