"That's good and she did arrive at a crazy time, so it's expected." Look at them sounding all grown up and civil. He might have gone with it except that he'd told Sirius that he would be brave and they'd be a new kind of marauders grown up and not doing stupid things.
"I'm not good," he finally said. "Cassandra- She was nice, special. We were friends, more than. Nothing had happened, she was from a different century so things were going slow, but I liked her," he admitted, "but that's not why I wanted to talk to you."
He took a deep breath. "The map. Sirius told me you want to redo it. That's part of why I wrote to you. Not the map, but talking to Sirius made me realize a few things- I was scared, not just of Bella, but of what you guys would think, and so when we got here, I lashed out, because if I was angry and pushed you away, you wouldn't have the chance to push me away. I was so afraid of... everything, and I'm sorry I'm really sorry, for everything. For the way I acted when we got here, for what happened at home, for what happened in the future. I know this doesn't make up for my actions, but I wanted you to know."