I came across this sentence watching March Comes In Like a Lion. I'll transcribe it to the best of my ability: (here's the episode though, and the quote happens at 5:46)
This is the translation in the subtitles:
I'd been careful not to presume on their kindness, but actually, they've never depended on me for anything. That's right. Not even once.
My best guess is that it's basically an incomplete sentence, with some implied conclusion that makes so much sense / is so common that it just gets dropped? If that's not the case, I just don't get where the "not" and "never" would come from. Any help would be appreciated!