My bf is also addicted to pain pills. This site is a great place for you to come and share. There is a lot of good reading on here, too. My bf used for 7 years, was clean for a few months, relapsed for a few months, and has now been clean for over a year. We have both been through a lot. I have been trying to learn how to let go of his problems and to try not to get involved in his recovery.
As others have said, it's about more than just their drug of choice. They have to get off the drug and go through withdrawals. They also have to change the way the way that they deal with their lives and with their emotional issues.
I still have issues with my bf with honesty. I was very hurt by all the lies and covering up. Even today, his words/behaviors triggered old feelings of anxiety that I had from when he was using.
Have you read the book, Codependent No More? You may find that helpful.