Welcome Like2. This site has a lot of good info for people wanting to learn more about their spouses condition. I personally believe that a lot of people think their SO has NPD until they learn about BPD and everything starts to make more sense. When you are comfortable, feel free to share more about yourself and your story.
Until then, check out the links of the right side of the page and learn more about BPD, how it affects your SO, and what you can do to stop making things worse.

Welcome.