I can totally relate with this song. I used to be so obsessed with my ex girlfriend and do whatever she wants me to do. I was being fooled, she cheated on me twice. How blind I was the first time she did that and forgave her easily. The second time was different, I felt like she doesn't deserve my love and my every effort or maybe my love for her has already died.
Eventually, I broke up with her by saying "i don't love you like i did yesterday!".