I totally agree, threating that way was very cruel.. He saw the pics and assumed Pallavi helped Anjali, he didn't even enquired Anjali and why only he is targeting Pallavi to punish, what about Anjali.. His Anger is completely understandable but his actions are not...
Instead of threating her, if he asked her help to prove him innocent to his his mom and media, she would have definitely helped him. For him the priority should be proving himself innocent to his mom and not taking revenge from Pallu...