he showed too much love to pratigya, she dusnt listen to him, when he talks kindly to her, so what should he do? obviously he will be angry n treat her like this!
we all know he luvs her, but pratigya never gave him love in return!! so now he has no option left, but only ZABARDASTI, i know there wont make any difference to pratigya, but who'cares, she hated him b4 and hates him now also, buttt if u watch it from krishna's view, he is totally right!