"He's used to it." Anakin doesn't even stop to think that "used to it" and "ok with it" are different.

"People, my men, are dying because of him. We all need him gone." Lies and betrayal and a target even the Jedi can't fault him for taking it out on. He needs this.

"Fives...he knew something. I. I need Rex don't I?" Honesty he wanted Fives back. It wasn't possible but that didn't stop the want. Especially now.