You are not the issue here. It is an awful disease and a vile drug.
A common thing I am reading is that we can’t do the work for our addicted loves one, which is so hard on us. They really have to want to get help.
I would say if you are staying with your partner, for your own sanity set some clear boundaries and be prepared to stick with them.
Coming on here has helped me a lot, it can be so isolating dealing with an addicted partner