I seem to recall making similar dialgoue choices when I did the Aerie romance, so I think you are ok. There are a couple other plot related dialogues where she will make mention of your relationship, but in terms of the timed romance dialogues, I think you have it until ToB.
i would recommend the flirt packs here. doesn't really continue the relationships in the form of dialogues, 'tis more to remind you you have a relationship before you get to ToB.
