Mom keeps fighting me because she wants me to pick her side?

Three years ago she said my dad cheated on her and none of it sounded true. She is ALWAYS with my dad so I’m thinking how in the hell can he cheat? Also he doesn’t make a lot of money to even do that or get a younger woman’s attention. That’s beside the point but my mom has been arguing about this shit for three years and keeps saying I need to take her side? I have no clue wtf went on so I’m not fighting anyone. It is not my place to do that. She tells my dad I can’t talk to him because he cheated? I’m so confused and pissed off. Has anyone gone through this? What do I do?

Mom keeps fighting me because she wants me to pick her side?
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