It sounds like you are going through so much right now.  We want to make sure that you
are okay and safe.  When you said that you might not be around for long, what did you mean?  Are you wanting to hurt yourself? 
Struggling with substance abuse can be so overwhelming.  There are times where I am sure you feel that there is nothing you can do, but there is. You said that you have had treatment for your substance abuse in the past, was it helpful?  Have you considered getting back into treatment?

You may think that nothing or no one can help you, but there are people and places you can go for help.  It sounds as if your girlfriend cares about you a great deal.  She would not be making an ultimatum if she didn't.  It is extremely difficult for people to watch someone they care about deteriorate.  She could possibly be thinking that if she doesn't do something now you will never get help.  This may be the perfect opportunity for you to get the help you need. 

While you are using drugs to deal with a traumatic event, it does not
mean that drugs are your only option to cope.  I am so sorry that you
were molested.  You did not deserve something like that to happen to you or to suffer without any help. 

I want you to know that we are here 24 hours a day any time you need to talk about anything. 

Andria