Should my parents get separated?

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Ever since I can recall I have seen my parents fighting on all issues.My mother is of dominating nature.There were problems in her family beacuse her father's business was closed.She had to study and take tutions 4 her family.Then started working,when she met my father.He approched her for marriage,though she says she was not that willing as all her family was on her,but it happened. Thereafter she used to humiliate my father telling he is nothing without her.They both had hard time making all assets.But when had some,my mother used to say "I did this","I did that"."We",was never in her talks.My father used to feel bad.Then she started telling these things to others also,in parties,at home. My father used to listen to everything as he wanted to see my brother and me happy. Then 3 yrs back my brother died in a car accident. Even then my mother used to humiliate him,as my father went on the track thinking my brother's soul is in the house,he will come back.These things were not practical according to my mother.She used to say all bad things to him and even about him to others. Then this unfortunate thing happened,that my father started sharing his feelings with a girl in his office,who is of my age.They used to talk on phone late night even.When my mother came to know about this she started abusing my father. My father says he started talking to that girl as my mother was not ready to understand him,and all these years through he has suffered a lot. My mother at times says she would do things to bring my father back to her.But sometimes says she wants to get separated. Being their daughter I always wanted them to be together,but now even I feel sick of things that are happening. Pls help,what can b done.