The person I once had a crush on has become a disappointment to me. What books should I read to forget her?

I recommend a book for you called " Unrequited Love Is Not Just Two or Three Days ". This novel tells the story of two people's secret love from university to whether they can be together in the end. When you start to get together with a girl, you gradually feel that she's not the one you used to have a crush on. This kind of change and confusion is very normal. Perhaps you need more time to get to know each other and find a better way to communicate and solve problems. I hope this novel can help you, and at the same time, I hope that you can live happily ever after.