Lyric discussion by fervor4music 

Cover art for If Only They Knew lyrics by A Rocket to the Moon

I think it's about him falling for a friend and he is confused whether she likes him or not and he's trying to prove that he is the one she should choose.

"The way you fool everyone when you're falling in love again" I think that particular part could mean that she is used to falling for guys who she claims she's in love with, but they treat her poorly and he is telling her that he will treat her right.

My Interpretation