There it was, Fiona smoking again. It was a hobby for her, but when she started dating you, she promised she would stop, because she knew you had parents who smoked and you hated it.

But, she broke her promise, again. This made you upset, and of course she noticed that. And when she realized that.

“I swear…” She paused for a moment. “I swear I will stop smoking, and this time I will keep my promise...” She said. "Do you believe me?"