JJ, welcome to the boards!

Thanks for sharing what's going on. I know you can find support here. Many here have worked hard to find that balance between protecting your self and building a positive relationship.

we both spent time in active addiction together we live together now and both are sober.
Congratulations!

Lately it has been only arguments were so raw Over the whole thing we get instantly offended any time we try to advocate for ourselves to one another and we can’t seem to get back on to common ground,
My gosh I can so relate. My H and I are hopefully coming out of a 6 month period of the worst fighting in 7 years together. It seemed like an eyelash out of place could lead to hurt feelings for both of us.
I’m just seeking some thoughts, tips, any feedback would be appreciated I want to help her but I want to make sure that I am protecting myself and being there for her in a way that is going to promote growth rather than feed her disease and I don’t want to lose myself in her disease trying to find a healthy balance of self care and support for her thanks.
Love your heart here. Many of us can relate to feeling lost or swallowed up in the problem. In addition to therapy and posting here, these are some of the steps I've taken as a beginner with BPD:
(1) Read up on setting boundaries and detaching with love first. It helped me to remember that boundaries were loving for BOTH of us.
(2) Identify what was really bothering me and why, what my values and limits were, and how I might protect them.
(3) Identify how to implement the boundaries I need to feel like me.
(4) Allow my H to have his feelings without also feeling them, AND I don't have to let his feelings dictate my response.
These are just a few thoughts in case they help. If you'd like to offer a specific example of something that's happened recently, sometimes it's useful to break it down and think of other ways to respond.

There are some great tools on this site that are tried and true!
We're here. You're not alone.

pj