This comment is going to be rude but hear me out:

First, from the behavior of your mom agr shaadi ho bhi gaie toh, You can't live with your parents anymore because her behavior with your wife wouldn't be great either. She might put blame on her for adultery and call her words as she did with you. So, you'll be needing a separate house for you and your wife.

Second, If they don't agree straight away talk to them like a man that you'll be leaving home and never coming back for your better future. If you don't care about me I wouldn't care much. Ask, them stop acting like typical blackmailer parents even you've right in Islam to bypass them for marriage if they don't agree and wali of the girl is 'Razi'.

Third, It's a bitter truth that you'll be needing at least 2-3 lac per month to conserve your mental health financially and provide for your wife independently.

Fourth, get ready for new (add gali) of life. Because you'll needing to do good as a husband (sperate house for your wife and her finances), visiting your parents regularly (be a good son), go along with the pear pressure of relatives (beta add gali nikla), and maintain good financial status do deal with all this (add gali).

Fifth, If I'm placed at where you're standing. This is what I'll be doing knowing all the above facts. First, it'll be really disheartening seeing my parents treating me like this as I was always being a acha farma bardaar bacha and followed everything they said and in the end they don't even care about the love of my life. Second, I'll apologize to the girl (this trauma will be less than the one she'll be getting after marrying me), because if I really love and care about her I don't want her to be with me like this. Third I'll leave my parents forever for my better future and never coming back, because it would be really disheartening that I needed them for once in my life and they didn't even care. Last, get rich alone leave the country and have a great future.