A Real Cheater
This story involves a good for nothing cheating father that’s actually cheating on his wife with another woman. The OP is an adult now, and the fact that their dad is seeing another woman is tearing them apart. We think it’s because it’s too late to blackmail the dad and ask him to buy them an N64 or something.
Or it might be because they’ve created a mental image of their father as a hero—a man who stands up to evil, no matter the cost. Yet, here he is, committing the greatest evil of all. In this situation, do you tell mom about your scumbag dad or what?