To me this song is about being in love, even if you know it probably won't work out. The song says "Chances are, we'll find a new equation." New equation as in a new person for each of them. It's very unlikely that the two people in the song will always be together, and the one writing is realizing and accepting that. The person is acknowledging that it is possible that the two could stay together "Don't get me wrong I never say never" but the beginning of the song is about how they probably aren't going to stay together. The end of the song, however, takes a happier turn. "Chances are we'll be the combination," is about how he thinks he's found the one. "Chances come and carry me" describes how he's so happy he feels like he's being carried.