Wow. I found this very compelling, and also very dark. There's no possibility of a happy ending for any of these characters, only the destruction of whatever magic - Mirror, memory or love - that brought them together. At the end, the Mirror lies in shards, and things aren't looking good for Teddy and Victoire.
Or perhaps Victoire will remain happily oblivious to Teddy's adultery, just as she never did see the Mirror. But what will happen to Teddy's son Romulus? Perhaps there is no end to this unhappy cycle.
It's great how you use the Mirror to "reveal" (sorry, I must have some humor!) all these possibilities, even when it's in fragments. I always did find the Mirror one of the creepiest Magical objects JKR created.