you're no good is very clearly about someone with depression and how they let misery consume their life. it's to the point where it gets in the way of being in a happy relationship. the singer falls into a deeper depression and develops suicidal tendencies (downright trying to commit via car crash) this misery is "personified" by sascha's lines. most would assume this is who the you're no good part is directed to but the singer is talking about themself. wallowing in misery and self loathing the singer only reiterates these negative feelings and never moves past them
you're no good is very clearly about someone with depression and how they let misery consume their life. it's to the point where it gets in the way of being in a happy relationship. the singer falls into a deeper depression and develops suicidal tendencies (downright trying to commit via car crash) this misery is "personified" by sascha's lines. most would assume this is who the you're no good part is directed to but the singer is talking about themself. wallowing in misery and self loathing the singer only reiterates these negative feelings and never moves past them