Thank you very much for your kind message. I understand the situation that you explained.
As you know, this is the nature of samsara, these things happen. It is part of the quality of samsara. Usually, when we say qualities, we mean something good, but here it is the suffering of samsara, a shortcoming of being in samsara that you have to experience these things.
According to my divination, there is definitely harm from black magic involved. Of course, Buddha doesn’t receive harm from black magic because he has no karma. Bodhisattvas do not receive harm from black magic, either, or arhats, who are free from delusion and karma.
I suggest you perform Lion-face Dakini practice. This is extremely powerful. It has been proven. There is a student whose closest friend was helping the Dharma center where she lived, and when she split with her partner, all the students turned against her and criticized her. I told her to practice Lion-face Dakini and then it completely changed and everyone turned back toward her. This practice is known to be very powerful, particularly for this kind of situation. So, if you can, recite the mantra and practice the meditations.
When doing this practice, don’t think that the interferers are a person. Instead, think that the interferers are the delusions. Don’t destroy the person. Destroy the delusions. Try it for a few months and then see how things are.
I am very happy that you recite the mantra OM MANI PADME HUM continuously. That is a great gift for me from you. The more malas you recite, the greater a gift it is for me.
Pray every day to make your life most beneficial for sentient beings. If you don’t know what is best to pray for, then pray to Medicine Buddha and especially to the gurus.
Pray to the Compassion Buddha and pray to be like the Compassion Buddha, able to benefit hundreds of others by having the same qualities as the Compassion Buddha, and also to be like Lama Tsongkhapa, His Holiness the Dalai Lama, Medicine Buddha, and Tara.
Then, pray never to be separated from the guru and the Triple Gem from now on, in all your lifetimes: “May I always make offerings to the guru and the Triple Gem and never be separated from them, and may I always receive the blessings of the guru and the Triple Gem in my mind.
“Due to all merit of the three times collected by myself and others (which does not exist from its own side), may the 'I' (which does not exist from its own side) achieve enlightenment (which does not exist from its own side), and lead all sentient beings (who do not exist from their own side) to that enlightenment (which does not exist from its own side), by myself alone.”
This dedication makes your merit inexhaustible and makes it impossible for it to be destroyed by heresy or wrong views.