They're the pure light and darkness around here, correct? Or, at least one of the pure lights in Vatheon. [Derp, can't forget about Kairi.] I don't quite understand their need to be together, but as far as dealing with Ventus' friend is concerned...you might be better off not talking to her until she's cooled down. It doesn't matter who's right or wrong when one person is being more emotional than the other.

Good luck with that, Riku.