well i didn't see the segment
but from your description,
for now guddan's behaviour is justified, as she thinks he is mastermind of all this.
She believes he kidnapped her sister & blackmailed her & now denying all.
In these circumstances any girl would be scared of staying with him in the same room at night. As for guddan, if he can kidnap her sister & blackmail her, he can do anything with her now. So he can't be trusted.