True Confession: My mother asked me to bring my boyfriend’s sperm if I want him to marry me

I’m a 36-year-old single lady. I have been dating this guy for over 4 years and he promised to marry me.
On several occasions, I have caught him cheating on me. Once I caught him in the act, he begged me and I forgave him.

After one year, I caught him cheating again and I told my mother. She advised me to bring his sperm to her and she would make him marry me in less than 4 months.
I am confused.

I don’t suspect she is a witch or anything like that because she is a prayer warrior in my church, she sees visions for people and they come to pass.

My question is, what does she want to do with the sperm?

I have asked her several times and she says I should not ‘question the spirit’.
I am also scared because I don’t want him to abandon me after so many years of dating and go to marry another woman. I have suffered with him.

Do I tell my boyfriend what my mother asked for? Or do I just do as she has said? I know she is my mother and will not mislead me.
Please, I need your advice.