I think anvilhead has a great point:
It’s not about you. It never was!
When you first began posting this is what you said:
{I'm kinda upset that I feel I still need to rescue someone who never wanted to be rescued and someone who never appreciated everything that I sacrificed and did for her.}
Her drug use was never about you. Her choice to use again was never about you. The fact you couldn’t get her to stop using, stop lying, stop manipulating – DOES NOT MEAN YOU FAILED, because none of that was ever your job in the first place.