I decided to write this one-shot because there is just something so mysterious and complex about the Dumbledore/Grindelwald relationship. J.K leaves out so much about these two that it's really up to your imagination on how things went down. This is mine.
Grindelwald. Gellert Grindelwald. The name haunted him every time he closed his eyes. How could he have been so mistaken? Gellert was the only one he could really relate to. Someone as brilliant as himself. Someone who understood, comforted, and taught him so many things. Albus thought they had something. In fact, he knew they did. Yet now, Gellert was gone. Out of the country by the looks of it. And Ariana. Poor, poor Ariana. None of them deserved to live after what they had done. After the fatal mistake one of them made, nothing seemed to make sense.
The only thing that had made sense to Albus lately was him and Gellert. The two months they had together was just enough time to realize that they had a connection, and a strong one at that. It had started out as just friendly conversations, escalating into what he considered a full-blown relationship. It was the first time in ages that Albus cared about anything besides schoolwork and his family. He finally realized who he was and understood his emotions with Grindelwald there to guide him. They're exchanging of notes had become a daily norm for the two. Luckily, Bathilda thought these were only innocent ideas being exchanged between friends when they were actually love notes, being exchanged between lovers. Foolishly, Albus still expected there to be a slim piece of paper waiting for him under his pillow as he walked into his room. But no, Gellert was gone. He fled like a killer from the crime scene. He left Albus to try and fill the gaping hole where his sister, parents, and Grindelwald himself had once filled. And now he was empty.
So, hope you enjoyed! Please review, it would make my day. :)