I loved the first story and even though this ending isn't one I'd wish on anyone that much in love I also love this continuation.. this end. It was heartbreaking and so very touching. It's sad that this happens, too often in life that those that love each other have to let the other go so that they can be the person they were meant to be. In a perfect world this would never happen, in another perfect world they'd be a part for a while but then something in fate would allow for them to be together again.. but neither of those perfect worlds exist.
You've done a wonderful and awful (maybe wonderfully awful?) thing here by showing how unfair life can really be. So many love stories have only the happy endings, but not all love stories end in happiness. It really is better to have loved than to have never loved at all. It IS worth it. No matter how much you feel like it's tearing you apart.
Now to go find something else to read that will stop these tears! Ugh! I really should look into buying stock in Kleenex. Between you and one other author I've gone through an entire box in two days!