All the gushing in the world will not fix a woman's head if it is fucked up because of use. That wasn't your fault darlin. She is your child's mother. If she didnt want to me married to you anymore for whatever reason -ok, then get divorced and be a mother, live your life and deal with it. Might be better/might be worse on your own. Sounds harsh, but I am just keeping it real. In the end she would have realized, "Oh shit, maybe it wasn't so bad being married to a guy who actually cared about ME and not about my tits and ass." duh ... and pray to God that you find at least one more good man that will want to deal with your shit.
But to just give your child up for drugs?
I can not fathom that.