I think this is just about blaming someone for the pain you feel. You thought that they liked you, but then they turned around and started to ignore you or stop liking you. She knows she should move on, but she doesn't know how to or if she'd even be able to. She likes him too much now and she doesn't know what to do. She blames him because if he had never given her the light of day, even momentarily, she wouldn't have such a hard time getting over him or moving on.
I think this is just about blaming someone for the pain you feel. You thought that they liked you, but then they turned around and started to ignore you or stop liking you. She knows she should move on, but she doesn't know how to or if she'd even be able to. She likes him too much now and she doesn't know what to do. She blames him because if he had never given her the light of day, even momentarily, she wouldn't have such a hard time getting over him or moving on.