Krishna supporting pratigya is not a big thing. He is quiet aware of angad's tactics, and he should be able to connect the dots angad suggested to krishna that he kidnap and marry, but instead angad kidnapped her and there he needs to talk to his wife and find out what happened.
Krishan scared pratigya in the beginning as well with him being a secret admirer, and sending gifts.
Pratigya should have told krishna what happened before marrying him, but everything started because of angad, and even krishna was ready to show his hooliganism in harming pratigya before he fell in love