How can I ask my boyfriend the exact date when we became boyfriend/girlfriend?

Anonymous
We started out as a physical relationship only. That’s what he wanted. He thought that he wouldn’t be able to be very good in a relationship. He has low self esteem. Though he’s always taken me out to dinner. A few months ago we went on vacation today. After that i see him more. He’s planning stuff into the future. I’m going to meet his coworkers soon. He wants to meet my family.
How can I ask my boyfriend the exact date when we became boyfriend/girlfriend?
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