Why hasn't my boyfriend introduced me to his parents?

I have been with my boyfriend for 6 months and I find it strange that he hasn't introduced me to his parents yet. Thingsare getting pretty serious with us so I don't know what's wrong. Do you guys think it might be too soon since its only been 6 months?
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A lot of you have said I shouldn't b worried if he is not close to his family, but he says he is, ad he says he is a very family oriented person... :( should I be worried?
Why hasn't my boyfriend introduced me to his parents?
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