This is a lovely poem, Xiomara, very expressive. The refrain reminds me of Neruda's "On this night I can write the saddest lines." I also appreciate the allusion to Sophocles, who spoke so eloquently regarding grief and pain.
My only question is, why do you call it a villanelle? I have written a few of those--definitely a challenging form, with strict rules regarding meter, rhyme scheme, and repeated lines. (For a famous example, see "Do not go gentle into that good night" by Dylan Thomas.)
That's not a criticism, though. There's nothing easy about composing good free verse.