I Think this song is talking about 2 people One of whom doesn't know if being with the other is worth it, while the other feels like they would do anything for the other and hence " i would die for you" The first person, lets just say its a girl, isn't sure however, the guy argues, "how will we know if we just dont try, we wont ever know" and the bridge describes he wants to show her how much she means to him before she can think up of another excuse/facade/ or have another disguise to present to the guy to give him another reason why it wont work or why she isn't sure.
These lyrics mean alot to me, I'm in this situation now:/