r/Relationships_Advice OP makes a shocking discovery when he finds out that his father is cheating on his mother. To make matters worse, his father is dating a girl who's young enough to be his daughter! In fact, the girl went to OP's high school and was one grade below him. It turns out that his father was cheating on his mother while the mom was caring for a sibling who had a life-threatening illness. OP doesn't know how to feel because the father doesn't even act guilty about it. What should he do?

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