Wonderful way to spend Christmas day, she thought. Attempt to choke and crush the only friend-like person that you've ever had and skip Christmas dinner.
She was almost starting to regret her sudden anger, but it wasn't as if she could do anything about it.
Nagini became a female equivalent to Lord Voldemort at Hogwarts. Her loss of her only friend pushed her farther into blackness than she had ever gone. Rather than spending her time in the common room, after she had finished reading the one thing of Voldemort she had left, she spent it in the Restricted Section of the library.
After her rather miserable social life in the first half of school, she was focused on more or less, the same things as Voldemort was. People feared her, wanted her to life them, to pity them, to have mercy on them. Voldemort had been slowing her down, turning her into a follower rather than a leader.
For the first time of her life, she was coming out of the shadows.
Voldemort was keeping a careful eye on her. He hated how weak she made him feel, how she had a potential to be a strong enemy. He only made one slip up and unlike his followers; he could not make her cower before him.
It was three years later when she finally caved in to regret.
She saw Voldemort eating in the Great Hall and beckoned for him to follow her.
He got up and followed her outside, into the warm air of summer.
He crossed his arms and raised an eyebrow.
"I know it's been three years, but I'm….." she took a deep breath, "Sorry."
"Why are you only saying this now?" he inquired.
"Well, I'm not sorry; I simply regret losing the only person I had ever liked."
"You call that an apology?"
"Just be glad I'm giving you a choice about this. Maybe you can handle complete solitude, but I can't."
Voldemort could see a single tear threatening to fall onto her face and roll down her cheek right before it promptly evaporated.
He finally said "I forgive you."
He did something he never had done before. He hugged her just as tears quickly escaped out of her eyes.