Before I kicked my addict boyfriend out of my son's and my life and home, I did a mental exercise where I envisioned exactly what I wanted for my child as he was growing up. It did not include living with a drug user EVEN if that drug user was his father. I had to make a tough choice and I ended my relationship because I thought that providing a safe, stable, drug free environment for my son was more important that trying to force my ex to be the father that I had hoped he would be. It was a wise choice. I didn't give up hope, I just chose to live in the reality of the situation and not hang my future on HOPE that someone else would change. From this website, I learned that if I wanted change in my life, I was the one who had to change.
There's no reason you can't HOPE on to hope AND live seperately from your BF.
What's preventing you from leaving (I'm mean financially, physically, etc), besides the HOPE that your boyfriend will change?