I asked a master to interpret a dream, and dreamed that my boyfriend's hand was cut off.

Thinking during the day and dreaming at night, dreams are still related to real life. From my personal experience, have you been exposed to similar scenes in your daily life recently? Maybe it's not that exaggerated. That's it. Novel? News? Tv series? Accidentally cut your finger? Wait a series of possible related plots. Maybe you didn't care too much when you saw them, or you weren't impressed, but in fact these fragments are stored in your brain. It's just that when you sleep, your brain doesn't get a complete rest, and it will randomly combine the information you stored. You know that people are smart animals, and your brain may exaggerate these plots and put them on someone who has been impressed recently and is easy to remember, or even someone who has forgotten in the depths of memory. Most of our inexplicable dreams are formed in this way, but when people have some thoughts that they have been thinking, their brains will dream about what you have been thinking at night, so it is easy to tell whether these dreams are related to real life or to your voice or worry. You know exactly what you want and worry about. If you think these dreams are absurd, then these dreams are when your brain writes a novel by itself while you are sleeping.