Nains and Dev- rab ne banayi jodi?

yes Nains is evil but she is blaming her husband infront of Geet, so that G hates D...this way D will be all hers...but D is also not less, he is somewhere guilty of doing this to G...but why did he slept with her when he was married and so called loved N? thats his cheapness, he took the advantage of the situation...and doesnt he know what it cld result into? he never checked back on G, and left her in quandry.....he knows how Brij is....so if he has some kind heart somewhere, he cld have tght of all the consequences...