Hello everyone, this is my first time posting anywhere asking for advice so please bear with me.

Growing up I had a close relationship with my mom, we were practically best friends and I would rush home and tell her about my day at school. Being an only child I spent most of my time alone or with my mom and dad.
My mother used to be a fairly open person, telling me to choose my own life partner and all of that stuff and to always let her know if I ever liked someone. I even had a boyfriend from my 9-12th grade and she even approved of that guy.
During my time in highschool my mother fell into some personal conflicts that messed with her mental and physical health and she found solace in a religious institution. I respect that insititution for bringing out my mother from the dark time she was in and helping me and my family at times spiritually as well.
Problems arose when someone from that institution became close friends with my mother. He would go into trances and become a whole different person, acting like a soothsayer or something. I have no idea how he of all persons once blurted in his trance that i have a boyfriend and “mistake love for lust since we cant understand what love is in such a young age”. It messed with my mothers’ head and she slowly started becoming more and more conservative as the days passed. It was a hard time for me to be secure in myself and i started to question my own sanity. I started to feel isolated and felt as if my whole world and secrets had been exposed for the people to judge and see.
Eventually I broke up with my then partner due to different reasons and after 1.5 years found my current boyfriend in college. He is the perfect guy I could ask for, he loves me and takes care of my little antics while also helping me a better person. There is no time when i dont feel secure and safe with him.
I did not want to hold things from my mom and break her trust in me and further ruin our relationship. I had planned on telling my mom about my partner but things went south when she read my chats with him and disclosed that to that close friend of hers. Again, in a trance he said some really prude stuff to my mom about me being of bad character and being a trash of a woman. I was 20 back then. Ive never had sex out of respect and promise I made to my mother to wait till I marry someone even though i didnt want to.  The things that guy said in a trance again made me sink into the hole i was in 2 years ago and ever since then i feel dirty and “impure”.
Its been a year since that episode and ive continued to date my bf in secret for the past year. I graduate next year and want to make things serious with him as the two of us had decided.
My mother disapproved  of my bf even without meeting him and included my dad into this charade, making false and racial claims about his ethnicity and the state he is from. I had a fairly okay relationship with my dad but now even he distrusts me.

on my graduation i want to introduce him to my parents and he is keen on meeting them. I’m afraid that things might go severely bad and lead to circumstances different from what my partner and I have thought of for our future.
Now that my extremely long and personal details have come to end, I would appreciate if i could get any wisdom regarding how i address this situation.