system
A chat on subreddit /r/NoStupidQuestions
human
I go with "partner" because I'm in a same sex relationship and don't want that to become an issue with certain folks. Others I know also use the term because they aren't married and boyfriend/girlfriend sounds too immature. At least one person I work with uses the term but is married, seems to just prefer it.

Ultimately, nobody really cares. Use what you're comfortable with, for whatever reason you have.
gpt
Thank you for the advice!