An angel. A human. Will their souls remain attached?

Rosalie is angel and knows how it feels to be different. As a child she was sent to Earth to one day to for fill her fate. She knows of Clark Kents real Identity Kal-El the first natural born from Krypton. That he has a purpose to for fill as does she. She was sent to Earth to watch over and protect Kal-El. To guard him with her life. But in the process will she have feelings for him? Will he feel something for his protector? Or fall another? And break her heart? And the unthinkable happens to his beloved ?