What does it mean when a guy says you're "off-limits"?

LILOah21
So I recently went out to the club and I seen one of my (guy) classmate's from High School. We were catching up on how we both were doing and blahblahblah - then somehow we got into the conversation about how I was "off-limits in high school". I kept trying to ask him what he was meaning by that, but he never gave me a straight answer. I was just wondering what he meant by "off-limits". I mean - because I never had any serious relationships in high school nor was I a big slut or anything. Any advice on what he meant by this & do you think other people thought that about me too?
What does it mean when a guy says you're "off-limits"?
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