How do i handle my parents separation??

I feel like that its my fault that my parents are splitting up, I had a chance to stop a situation that prevented my mom to make a decision to leave my dad but i was to late. My parents had been married for 27 years old, as a child all i can remember is my mom and dad argue a lot and verbal abuse one another. A chaotic incident had happen 3 weeks ago, dad was yelling at mom to shut the water off or turn it down when not in use because he didn't want her to waste it, they have 2 pink slips from water company and behind in payments, mom told dad I am not going to listen to you, you don't control me, then 1 thing led to another which had made mom antagonize him which prevented him to sprain her leg when she had placed it in his personal space and a mess blew out from their. Mom took time away from dad and stayed at her moms place until they cooled off. Mom came back to the house few days ago to talk to dad and made a decision its best to go their own way. i talked to mom yesterday to try to help and convince her to work it with dad but she had enough and is in deeply pain.
She says that he don't love her anymore,he treats everyone else he don't know better than her hes not nice and makes it hard to have a simple conversation. She cant even feel free to brush her teeth or run the water without him yelling at her. She told me one time she had soap in her hair while taking a shower and dad got so pissed that he went and turn the water off from the outside shes done had enough :(