If you want to say it, the possibility of your mistress keeping a secret is lower than 1%. If you are not afraid to offend your tutor, just say so. Needless to say, this tutor is an animal. Our country's laws are not strict, and it is a big sin for foreign teachers to sleep with students.
Then decide according to your heart whether to be a hero for three minutes or a bear for life. I don't want to mislead you. Sometimes life is worse than death.