This song gives me the feeling that the woman's taunting him by saying just how good a relationship with her would be, and she doesn't want anyone else to have him, but when it comes down to it she doesn't particularly want him anyway because she's happy being single, or happy just keeping things very casual. The line "a crack in your heart that can't be undone" shows a very pessimistic view of love, potentially because the woman has had a bad experience in the past and therefore can't fully commit.
This song gives me the feeling that the woman's taunting him by saying just how good a relationship with her would be, and she doesn't want anyone else to have him, but when it comes down to it she doesn't particularly want him anyway because she's happy being single, or happy just keeping things very casual. The line "a crack in your heart that can't be undone" shows a very pessimistic view of love, potentially because the woman has had a bad experience in the past and therefore can't fully commit.