I met a monk today, and he divined for me. Is this kind of thing allowed?

Tell you, fortune-telling and astrology are absolutely forbidden for monks, but a truly practicing monk can know your future destiny because he has meditation, but Buddhism says, "Destiny is not fixed, it is in his own hands." Have a look at Fan's four major disciplines. Now some places have renamed the four commandments of Buddhism to self-determination. You will understand after reading it. After learning something, look at the induction of the emperor's father. Do more good, do no evil, do good. Amitabha, good luck.