What do i do? My parents havent talked to each in 3 weeks and my dad has been sleeping in the upstairs room. My mom tries to talk and text?

My dad, but he just ignores her. At this point I feel really bad for my mom and i want to tell her to just move on at this point but i know thats bad cause hes my dad and her husband. What can or what should i do as a son? Some may say not to get involved because its not my buisness.
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