What does Aro say to Bella?

The first is: La Tua Cantante - Meaning Bella is Edwards Singer, Her blood sings to him. Talking about his strong desire for her blood.

The second thing Aro says is: Forse, nel vostro l'uno o altro It means: Maybe yours is one or the other or Maybe for you, it's one or the other. Basically Aro is saying it may seem to her like he has a soul, or for her maybe he does, but that vampires do not have souls.