He left her alone. Sadly it took longer than it should have for her to realize it, he was leaving her alone. Everyday for as long as he could. Avoidance, on a monumental scale. In the house he had moved her into without Nose’s permission.
They sat there for months before Nose admitted that he knew. She was thankful to not explain, mostly due to the embarrassment that it took Nose saying something for it to finally sink in. She did not realize it at the time, but this was Nose trying to help her feel better. Bella had unknowingly become one of Nose’s closest friends. She had been so lost in her own mind and worried about being a bother to him, that she had failed to see that he had actually went in the other direction.
Throughout Linus’ continuous abandonment Nose and Bella had been almost forced to spend every minute other than sleep, together. Not once had they fought or been short with each other. In fact, they had shared many fits of laughter and gained a large selection of inside jokes. Nose and Bella had exchanged the saddest and most private of moments from their lives all while turning around and laughing in the same breathe.
I believe it was safe to say that Nose and Bella had in fact become best friends.
A bond that had broken yet another string in the disentanglement of Bella and Linus