I think it talks about how his mother tried to bring him up as best she could with what she had, she tried to teach him wrong from right but he needs to find his own way and live life his own way, he makes mistakes but doesn't ask for forgivness and when he realises that he took her love for granted thinking it would always be there it was too late because she had passed away. The chorus is about asking his mother to let go and let him live.
I think it talks about how his mother tried to bring him up as best she could with what she had, she tried to teach him wrong from right but he needs to find his own way and live life his own way, he makes mistakes but doesn't ask for forgivness and when he realises that he took her love for granted thinking it would always be there it was too late because she had passed away. The chorus is about asking his mother to let go and let him live.