Pinkie couldn't take her coltfriend being away partying all the time, so, she cut it off.

Weeks later, a half-depressed Pinkie answers the door late at night while getting a glass of water. There's only one pony who'd be thinking of her this late at night.

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Side story of There's Always An Afterwords, in an alternate universe where everything up to chapter 8 happens except for Cheese agreeing not to travel.