To me, I think it would have been depressing. True, the heroine was still married, but the idea of her cheating on her new fiance would be quite sad if the fiance hadn't turned out to be such an a-hole...
By the way, if you haven't read this book, I highly recommend it. :)
Do you think the love triangle in this book would have been depressing if the author hadn't vilified one of the characters in the love triangle?