What should you ask a potential partner?

If you have a partner, how did you know they were "the one"? What questions did you ask or did they ask you to help figure out if there was a fit?

An entrepreneur who I mentor asked me what are some things he should ask or consider when talking to a potential partner. I told him "it's like dating. Use the first meeting to just get to know the person and see if you want to keep talking to them."