Ok the TL aside, the FMC feelings seem to be all over the place. She borderline threatens the MC when her best friend flirts with him. Then agrees to gather info on the MC when the same best friend asks for it. And now she looks all psycho because the MC is doing the big brother thing to his cousin.
I know she was forced into this marriage, but come on, pick a lane girl. Ether be jealous or not. One minute she is against the MC and best friend and the next helping the best friend to get with the MC.