What does it mean when a guy introduces you to his parents?

Anonymous
My boyfriend introduced me to his mom three weeks into our relationship and on our second official date. Does this mean he's actually serious about me. We have sort of dated before or rather we were having sex it was more of a friends with benefits thing. And now he's saying he wants to take things serious. by the way I'm 18 he's 17
What does it mean when a guy introduces you to his parents?
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