Cute song :)
I believe The Meaning of this song is quite obvious, but for Matt Himself the one he belongs to is probably his Band, Muse.
He has been in the greatest band to hit this world and his musical talent along with his good looks combined make him an important 'pillar' of the band!
Hence when he says "You are my Mu-" and after the french bit (which I think translates into Respond to my Kindness, pour me -drink-) and after it says "Use" You can possibly combine to make Muse. Maybe, I could be wrong.
Anyone can believe this song can be different, everyone is entitled to their own thoughts. This is mine ^^