Dear Starlight Glimmer:
Don't feel too bad about your boyfriend. The last time I saw mine, he gave me a cheeky smile and got on a train. Last I heard of him he was stuck with my old mentor.
Your new teacher, Twilight Sparkle.
Dear Twilight Sparkle:
Thank you for stopping Starlight Glimmer. It would have been a pain in the arse to deal with another idiot trying to mess with the laws of time. I still need time to recover after punching my way back to Gallifrey.
Sincerely, The Doctor.
Dear Starlight Glimmer:
So you think you can just sit on my throne and not get punished?!
...Fine. As long as you don't go anywhere near my shed.
Sincerely, Fluttershy.
Dear Fluttershy:
Of course I sat in your throne! How else was I supposed to make a point about the butterfly effect?
Sincerely, Starlight Glimmer.
Dear Sunlight Shivers:
I'm sorry, do I know you?
Sincerely, Starlight Glimmer.
Dear Rainbow Dash, Pinkie Pie, Fluttershy, Applejack, and Rarity:
Isn't it obvious? Any time I found a timeline where the five of you lived happily without me? I hunted all of you down and killed you before going back for Starlight.
...What? I wasn't just going to waste such an awesome opportunity, was I?
Sincerely happy, Twilight.
P.S.: The last timeline? That was the one where I succeeded in overthrowing Celestia.