"I'll steal your breath and throw away what I despise" : she has been hurt by her lover, and now she's afraid of feeling love for someone ever again, in case she suffers like she has with the previous boyfriend. So she decides to choose the aspects of the personality of the person, and to throw away the others, those which "burn her hands" and "scar her face"... so she wants an angel because an angel is flawless...
"I'll steal your breath and throw away what I despise" : she has been hurt by her lover, and now she's afraid of feeling love for someone ever again, in case she suffers like she has with the previous boyfriend. So she decides to choose the aspects of the personality of the person, and to throw away the others, those which "burn her hands" and "scar her face"... so she wants an angel because an angel is flawless...