To me it means, the guy has done things in the past that hurt his girl and made them argue, and he feels totally bad about it but he can't get over it. Since he can't get over it, he's starting to distance himself from her because he doesn't want to hurt her. No matter what they keep arguing so he asks her, "if this aint love then how do we get out". So she tells him, " i dont hate you"and that she loves him to much to give up on him, and she wants to help him get through his problems. He tells her he loves her but feels that he's not the right man for her.