Question

he was so friendly but minded his buseness

Answer 1

mind one's own business : در کار دیگران مداخله نکردن ، فضولی نکردن

اون خیلی خونگرم و صمیمی بود، اما سرش تو (ی) کار خودش بود .

Comments

You're doing a good job, honey.  +1

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Thank you so much dear E-Hamzeluyi. 

So happy to hear that from You!