A few things I remember about it.
~It was complete and had seven parts
~ It was set at the end of season 4
~ In chapter 1, it follows Kurt's turmoil about staying in Lima an extra week, and the boys meet at the Lima Bean and agree that they want to be best friends again.
~Kurt asks Blaine how he could cheat on him and still love him, and Blaine explains how Kurt basically had abandoned him and he did something stupid.
~In chapter 2, Kurt is back in NYC, and he calls Blaine to try to fix things
~Blaine has a list of things that explain the cheating/love thing, including Chandler.
~The author had called it a "fix-it fic"
Ring a bell for anyone?