The only answer I come up with Nakul did not marry simi and ruined Nitu's plan to separate Simbhi.Yes she knows she can easily use Omi to make her stay comfortable here.Indeed, I cannot understand why Neetu is angry with Nakul, he did everything possible to marry Simi as she wanted. Perhaps it is a general anger with the whole world - she's clearly suffering from a persecution complex, and feels everyone is conspiring to separate Vicky from her.
Funnily she is quite tolerant towards Omi - maybe she sees how she can make use of him.Also can't understand what made Nakul angry with her yesterday coz he doesn't yet know about her BF/pregnancy and she hadn't started her tantrums yest.CVs are again rushing to create feelings without establising a rationale.