My parents stayed together for me. Let me tell you it did more damage than good. I wish my parents had split up so my mom could have been happy. My mom asked me when I was 10 years old what I would do if she left my dad. I just said "I don't wanna be poor." I was 10. I wish she would have decided for herself.
So in my experience, staying together for the kids is no good. They know you're unhappy and if they're anything like I was, they'll think it was their fault you're unhappy. Took me till I was 27 to understand it wasn't my fault.
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