I think that he is singing about his relationship with his girlfriend in which he can not give himself as he should because he is thinking about another love,another girl he loves "all my tears have been used on another love..." He knows he should try in his actual relationship but he can't because he love this other girl.
I think that he is singing about his relationship with his girlfriend in which he can not give himself as he should because he is thinking about another love,another girl he loves "all my tears have been used on another love..." He knows he should try in his actual relationship but he can't because he love this other girl.