Netflix issue?

Danielle • Loving God, life, family, and the man of my dreams ❤️
So my boyfriend and I are on his account for Netflix. He is deployed right now , I'm in California. How come he can watch certain movies that I can't and vice versa? Also what does it mean when I want to watch a movie but it says "is unavailable to stream" "this title is available on Netflix DVD" but my boyfriend can watch that exact movie ???