You read wrong. HIV does not stay infectious outside its host.
i said that because i was reading study about survival of HIV in dried blood and the statement was that it can survive for a few hours, untill the blood is completely driedout, and when it is closed in place without air a few days must pass for HIV to become unactive
No, you're wrong.
HIV loses its infectiousness the moment it leaves its host (the human body). Dry blood cannot infect a wound, and wet blood cannot either. This has never happened outside the healthcare field.