It is amazing to me still, and a bit mortifying, how I reverted back to emotional adolescence to maintain any type of relationship with the BPD.
It starts getting better the moment you follow your reasonable "side" and conduct yourself like an adult.
This is SO TRUE. I have been beating myself up after my breakup for this exact reason. I thought I was so far past the point in my life where I would even be engaging in the type of madness that became the norm in the r/s. I tried so hard to stay above it but my sanity went quickly out the window after the first few weeks. Rationality doesn't go very far in these types of relationships I found, so if ya can't beat em, join em.