Torn between saving my family and prioritizing my son's well-being: How do I navigate this difficult situation?

Hello AnuJi I am 42 and my wife is 40 and we have an 8 year old son. We have recently been staying separately since 3 months after a lot of tensions and my wife's emotional breakdown. Our relationship has been strained since beginning. Though am very loving, caring and devoted to my wife I have possessiveness issues. My wife has been sacrificing a lot on her own accord for our marriage but during her emotional breakdown we learnt the hard way that she was feeling suffocated in all this. She even hurt herself and that is the reason I am very careful in approaching her for reconciliation. My son is with me which gives me solace but I am worried he will miss out on mother's love and holistic development this way. I am unable to create a pathway between me and my wife because she is currently very caustic, bitter, insulting towards me and my family and not willing to hear my side of the story / talk peacefully / agree for counseling etc. I considered having the child stay with her but she has a terrible temper and history of beating the child, sometimes severely and hiding this from me till I found out. I later came to know my child is developing a sulking personality because of this but being a child he is naturally affectionate towards her mother (infact he developed an attitude that he deserves to be beaten and slapped - something he is coming out of gradually now he is with me). Infact parenting style mismatch and arguments was one of the reason of our split. At this moment I want to do whatever possible to bring the family together - short of feeling humiliated / not being heard / agreeing to child being beaten. My wife and me are well educated and even nature-wise she has good qualities as well. I just don't understand how we seemed to have ended up in this mess so abruptly. I do not know whether I should adopt a conventional attitude of saving the family, compromising etc or prioritise individual happiness and adopt a more liberal approach of staying separately even if child misses out on one of our day to day love and care.