JDCooper - Welcome. We are glad you are here.
Generally, when we go into treatment, we need to make it our #1 priority. I know that it is hard to do with life, work, girlfriends, etc. The question is: what is the alternative? What will happen if we don't recover? For many, all the things we treasure go away as our problem gets worse, so you could lose them anyway.
I will let others with more experience on opiates answer those questions, but this is the time to make an investment in yourself and your recovery. With recovery, all those other things will have a much better chance of success. And you'd be surprised, your girlfriend probably already suspects something and may be more understanding than you think.
Call a NA or drug addiction hotline and see what is available. Not all of it costs money.
Glad you are here.