In Act 2, Scenes 1 and 2, Romeo's soliloquy conveys an idealized quality of love. How is he being idealistic?
First, concerning your question about Shakespeare's Romeo and Juliet, a soliloquy can't be in two scenes. Even if one scene were to end with a character giving a soliloquy, and the next scene begin with the same character giving another soliloquy, you would have two different soliloquies. Second, your question is vague, in the sense that the two scenes contain many speeches by Romeo, so it's difficult for anyone to know exactly which speech you're referring to.
That said, I think you mean Romero's speech that begins Act 2. Juliet is on stage, though, so this speech wouldn't be a soliloquy.
Romeo does reveal an idealistic view of love in the speech, though. Juliet is the "light," the "sun," and the moon is "sick and pale with grief" out of envy of her. Juliet is "my lady" and "my love." Two stars have asked her eyes to take their places while they are gone. And if the stars did take the place of Juliet's eyes, the brightness of her cheeks would shame the stars. When Juliet touches her cheek with her hand, Romeo wishes he were a glove upon that hand.
I think you probably get the point. These two just met, remember. Nobody is that great! Romeo is tremendously idealistic here. He has put Juliet on a pedestal and there will be no removing her. To Romeo, Juliet is "all that," whether she really is or not.