Blaine ends up at the same college as Kurt (I think in New York). Before he leaves for school he packs up everything in his room and leaves it boxed in his parents’ house but maybe he kept some piece of memorabilia from their relationship with him. At some point the boxes come back up in the story.
Blaine sees Kurt in their new city either across campus or in a local park. They ultimately do reacquaint themselves and reunite.
This part I may be pulling in from a different fic: Blaine has either a mirror or white board on his closet door and one evening (before the breakup?) Kurt and possibly Nick and Jeff doodle romantic stick figures of K&B and Blaine makes a point of not cleaning it off.