Question

"But soft! What light through yonder window breaks? It is the east, and Juliet is the sun!"

who is romeo talking to while saying this

Answer 1

If i remember it correctly I believe that he was standing outside Juliet's window when he said this. And he just said it out loud.

Answer 2

Looked it up - he was standing outside Juliet's window whilst saying this.

Answer 3

He's talking to himself