Sorta reminds me of a comic I saw where Pinkie gave her Hearts & Hooves Day card to Rainbow Dash just because Rainbow looked lonely and, according to Pinkie, Rainbow's her "bestest friend" in the world.
I randomly came across this in the new submissions bit, and I love it. I know it's sad, but that face at the end just makes me laugh. XD
I imagine it's kinda hard to find someone since like 90% of the town is female. That said, some people frown on OC ponies being shipped with one of the mane 6, but (if you exclude shipping them with each other) there aren't really many alternatives. *shrug*