Good day Sir/Ma, I got married to my wife in Nov.2

Good day Sir/Ma, I got married to my wife in Nov.2019, i quit my job some weeks to our wedding because of security issues. After our wedding we faced a lot of financial issues and we only survived to the glory as no one was there to help us..though her mum tried..we moved down to town closer to her family when she was pregnant so she could be assisted by her family while I seeked for another job.. I was idle for some months and one of her younger sister moved in to stay with us..during this time my wife behavior was something else as any small things will infuriated her and she always push me away or even hinting like she regrets the marriage..we always had issue almost everyday, during this period me and the younger becomes closer cause she always advice me and will also help to talk to my wife..I started having feelings for the younger sister,as times goes on we started having secret affairs like talking secretly, hugging, kissing etc.though no sex..my wife becomes suspicious of us and told the younger sister to go back home..she refuse to talk about it to me, I traveled for two to three months and we were communicating.then we both later realised what we are doing was bad and we talked about it and stop..we cut communication between us..my wife always harbor things in her mind..our baby is seven months now, we decide to start a new life and turn a new leaf..which I accept..we talked about alot of things and resolved them..o promised her to always be open minded to her, and never to lie to her again..some days after making that promise, she asked what is between me and her sister..I told her everything. She said how could I did such..I keep begging her it was all a mistake..she insisted I make love to her sister that I don’t want to tell her, that we couldn’t have kissed and stop..I told her I just promised never to lie to you again,no sex between us..she was devastated and abuses, curses me and is even hinting about divorce..I’ve been begging her since but all to no avail…pls what should I do… I’ve already regretted my. Action and have turn a new leaf..but she is just something else now… thanks