Shwet is idiot but had influence over Kunal. she wanted ki vo sirf apni maa pe bharosa kare.
Then Ben ba doesn't want Kunal to ever get married. Without trust, there is no relationship. Exactly what Mishti had faced with Kunal. Irony is Kunal turned out exactly the way big ben wanted him to (doesn't trust any girl)... but meenu is so scared that she can't even trust Kunal.
Kuhu will seriously have a hard time to win Kunal's trust.