Lyric Interpretations :
” Magic in its true sense is something which is not only beautiful but also cannot be explained. So he uses the word “Magic” for the love he feels for her.
Even though their relationship is now over and he is broken into two, his feelings for his beloved are not changed.
After all the torture he went through at the breaking point of their relationship, he still manages to love her and believes in her “Magic“. Read more interpretations HERE