Asad a businessman or brainless man

Asad is a businessman but is potrayed as a man without any brains and only physically strong but mentally weak. This is really stupid. Even after what has happened he believes Tanveer completely. If what she says happened is true then he should hv some kind of sign other than being shirtless n with lipstick marks on his body. Moreover Zoya has time and again told them that Tanveer is a liar nd that everything about her is fake but still nobody suspects any foul play in all this...