Yeah I doubt it that he’s been successfully hiding his ugly side for 5 years..if a person has a truly ugly side it comes out very fast..OP would have noticed it while being in a long term relationship with him
he’s behaving the way he is because the OP is clearly disrespecting him as well by saying he has no rights to provide his comments on shaadi/mehndi..who talks like that with their future husband/wife?! that’s definitely disrespectful and youre basically saying you dont care about their input or opinions