How is it that even when it's evident that this needs to end I find myself still even entertaining a conversation
I have only started with this online support group in the last couple of weeks, though it is clearly helping!
Maybe sharing my experience will help you determine how to proceed in some way:
We have had over 4 years of recycling, and no, being in a relationship with someone with so many traits of BPD is not healthy.
During the first year: OK with NC. we could part ways for a while (a few weeks typically) and, again, I did OK with NC.
Around 2 years: Addicted to her. I really became enmeshed with her emotionally and mentally. During NC, I would miss her tremendously, I could not stop thinking about her and us. I confided in my best friend that I was really "addicted" to her and would do anything to try to "fix" us and have us work out.
Around 3 years: Constant mental churn and obsession about her. I have a 24/7 "background" obsession of thoughts about her, it does not stop and it affects my ability to think and live my life. Even just a few texts or phone calls from her will set this off. I do not even have to see her.
The last time I saw her for about a month, it took almost 3 weeks for the the constant churn and obsession to finally stop.
The last time we texted and talked on the phone for a about a week, it took a week for the constant churn and obsession to finally stop.
The last time we talked on the phone for a couple of hours, it took about 2 days for the constant churn and obsession to finally stop.
For me, every time we "recycled", I became more enmeshed, more addicted, and more obsessed with her.
Hope my sharing this with you helps you determine how to proceed.
You will figure out what to do. Reading other's experiences has helped me tremendously! I am certain they will help you, as well.