From my long anaylasis of this beautiful song, I have come to the concludion it is about a man (or a woman but being sung by a man you tend to relate it) who is in love, but the his love doesn't nessicery love him back but he is shocked that everything he does and everything he is; has been changed due to his love "Do anything I want, Be anyone I want to be but it's us I see". "I can not believe I'm fallin'" is refering to his clear stubornness and Stocism towards such feelings usually but because he is so deeply in love he can't help but be completely derailed.
From my long anaylasis of this beautiful song, I have come to the concludion it is about a man (or a woman but being sung by a man you tend to relate it) who is in love, but the his love doesn't nessicery love him back but he is shocked that everything he does and everything he is; has been changed due to his love "Do anything I want, Be anyone I want to be but it's us I see". "I can not believe I'm fallin'" is refering to his clear stubornness and Stocism towards such feelings usually but because he is so deeply in love he can't help but be completely derailed.