Anonymous (You) had caught Fluttershy with another stallion, and though you had to wait for an opportune moment, it finally arrived. With her away for a day in Canterlot with friends, you release all your pent up frustration by destroying any memories of you two in her home. Having not enough to move out of Ponyville, but enough to rent a small place, you cannot escape the eventual confrontation.
When the time comes, you hope you can find a new life, even though the truth will hurt everyone and destroy relationships that could be more fragile than you realize. However, you have vowed to see it through to the end, and with that push forward into the unknown of your story.
Only thing is, why do you keep trying to fight the wanting in you to make it work? Make it last? One way or another, you will either leave Pony-Ville and everything with it behind. Or some-pony is going to convince you to stay.