This to me is not about an abusive relationship, but about the fear of a self-destructive person to enter into a relationship. "Tenderest touch leaves the darkest of marks" sounds to me like she is scared by a new relationship and beats herself up, but physically and emotionally for it, maybe because a past relationship was bad and she is too scared to try again. "Kindest of kisses breaks the hardest of hearts," shows that she is trying to love this man, but she can't bring herself to forget her fear.
This to me is not about an abusive relationship, but about the fear of a self-destructive person to enter into a relationship. "Tenderest touch leaves the darkest of marks" sounds to me like she is scared by a new relationship and beats herself up, but physically and emotionally for it, maybe because a past relationship was bad and she is too scared to try again. "Kindest of kisses breaks the hardest of hearts," shows that she is trying to love this man, but she can't bring herself to forget her fear.