Lunaa, I've been in your shoes (in another relationship with a non-addict). Textbook co-dependency, hon. It's a hard hole to dig out of, I'm not going to lie, but if I can do it, you can too.
It took a long time and a lot of small/baby steps, a lot of waking up every day and wanting to die, then realizing I "wanted to die less" each time I woke up until one morning, I sat up in bed and said, "I'm really going to be okay." And I was. You will be okay, too.
Only, back then I had no idea what it was called (co-dependency). I just knew it hurt like my soul was being torn into a million pieces. I didn't know where to go for support back then. You do know where to go, now (meetings). Make use of all your resources. I remember having to drag myself out of the house to keep from wallowing, but it got easier.
Have you tried creating some boundaries for yourself? Starting small?