Who said "This is where it ends."?

This quote is attributed to Bucky Barnes (Civil War).

This is where it ends. - Bucky Barnes (Civil War)

"This is where it ends."

Bucky Barnes (Civil War)

"I'm with you till the end of the line."

"That's all that's left, isn't it?"

"You know me."

"I don't know if I'm worth all this."