Did she tell you that she had just been pretending, or is that an assumption you made on your own? Isn’t it possible that she had wanted to meet up, even been planning on it, but then realized she was just too busy? Isn’t it possible she was also disappointed? You say she was telling you to ‘go fuck yourself,’ but this is EXACTLY what I’m talking about here. She set a boundary, realized she was too busy to go on a date, and you took it as her lying, leading you on, and being a bitch.
Maybe it wasn’t about you at all. Maybe she was just stretched too thin etc. All of this stuff about a woman saying no making you feel like a monster or thinking you were “a pussy” seem like things YOU are applying to the situation, not things that were explicitly said to you.