[She sighs, but it's fond rather than out of anything sad. He's right in that she knows better than that, and yet:]

And you know me well enough that I'd say that even while knowing that, right? [There's a hint of humor to her voice though, almost teasing.] You have nothing to apologize for, really. It's fine.

[It definitely isn't fine, but you'll never hear that from her!! She'll make use of her (un)healthy coping mechanisms for as long as possible.]