Dave Nivel writes for the person nobody writes for: the partner.
When someone is diagnosed with depression, ADHD, or borderline personality disorder, the books, the appointments and the advice all point at them. The person living alongside them absorbing the hard days, managing the household, quietly running out of road is left to work it out alone.
That is who these books are for. Loving Someone with Depression, ADHD and Marriage, and Loving Someone with BPD each take a condition usually explained in clinical language and translate it into something a tired person can read at eleven at night and use the next morning. Research, plain words, and sentences you can actually say out loud.
He does not write to tell anyone to stay or to leave. Those decisions belong to the people living them. What he writes is understanding, language and tools and a steady reminder that looking after yourself is not a withdrawal of care from the person you love. It is what makes caring for them possible at all.