Lyric discussion by numbskull 

i totally agree with you and dragic. he wants to tell her he loves her but isn't sure how she would react ("i can't calculate"), so either she would have to show him she feels the same or he has to get over his fear. I think in the second verse he has missed the right moment to tell her and things got more complicated somehow, so he would like to go back to the start when it would have been easier.

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