This song is basically about how she loves him, but he's no good to her. She's sick and tired of his attutude and she doesn't feel like she knows him anymore. He ruins her day. She can't believe in him. He makes her feel unwanted. He pushes down her dreams and makes her feel miserable just to keep him on her mind.
To me, he isn't the type of boyfriend I'd want. He doesn't sound loyal or at all nice.