The title is what brought me to read this, however I am a bit confused about it. I read it, and it was appealing, but I thought.. shouldn't it say 'unsung' not 'undone'. Maybe that was your intent though, either way I like it.

So I was brought straight in and in the fourth line is where I first fell inlove with this piece.
'Your voice is sweet as you whisper lies I regret believing' Something about this line.. I think it's because you said you 'regret believeing' the lies, as if you had a choice, and you -knew- that they were lies, but you chose to believe them anyway. I don't exactly know if that's what you meant, but that's how I interpreted it, and I'm fine with that because I love it and I can relate deeply with it. Wonderful line.
The rest of this stanza is so descriptive, creating lovely imagery. I enjoyed it a lot.
Then the last line, you again speak of a mistake you've made - but yet again, you can't choose to fall in love, you just do, I like the upside-downness of how I'm feeling within this piece so far.. I don't think I've quite felt this way while reading a poem before.

I think in this stanza you could use another word to describe putting the moments on your sleeve, instead of pasting them, in the third line. Other than the fact I think it sounds a bit out of place itself, you used that before with your smile. Just a suggestion?
This line especially hit me in this stanza so far;
'Who'll ever be allowed to touch me after where I've been'
It gives the reader a thought as to what has happened to you, such as rape, etc (just something that came to mind) when they read that something bad has happened in the past. Gives a touch of.. mystery and another tone of emotion to this piece. Well done with that.
And for the rest of this peice, I love the metaphors and again the descriptiveness of it all. You portrayed a lot of emotion within this and I like the way you expressed it all. I can relate very closely, which makes this poem so much more emotional to me, I can feel it within your words.

Excellent piece. 5/5

Tammie