Damon was selfish, everybody knew that. You were the only person in the whole world he couldn’t bring himself to be selfish towards and with, because even though you bantered and discussed, he loved you. He waited as Bonnie explained their options

“Well, if we want to kill Silas, we could find a dagger that’s been missing for a thousand years or there’s a spell you can do” she looks at you since you’re a powerful witch “but…there’s a high chance you die” she explains. “couldn’t let you do it”