What is the name of the song that goes ...?

What is the song by Hannah Montana/Miley Cyrus that goes "seems like, we're holdin' on for-ever ... I gotta let go, time's up, you're push-in' me to surrender" and later it goes like "you send me tumblin' for life, like there's no-one else ar-ound". I heard it on the radio, and I can't figure out what it's called.