The song you are referring to is "Wherever You Will Go" by The Calling, from their album Camino Palmero. They have been hailed as a sort of cross between Creed and Lifehouse...all three have the same knack for good songwriting and different melodies. I have had "Wherever You Will Go" in my head since I listened to the album last night. I haven't heard from my girlfriend yet today and am worried, and I find myself keep coming back to the song...