Yes, the ending was very sad. I guess the "message" of the movie is that you should go out and do what you need to do to be happy, rather than pretend that something else will make you happy. I suppose that Hollywood glommed on to this film as a counter to the political support that anti-gay marriage initiatives have received in the states where they've been on the ballot.
As a live and let live person, I can see their point. The problem comes with deciding what crosses the line between asking to be left alone, and shoving things down someone else's throat. I know a lot of my fellow Freepers think this film crosses that line, but I didn't see it that way.