Hi! I'm so sorry that people have been spreading false information about you :( You know yourself better than anyone else so don't take those rumors to heart! I'm positive you are a wonderful human being that deserves all the happiness in the world <3
And back to topic, Mafumafu had dealt with his bullying mainly due to Soraru. Mafumafu had a hard time trying to avoid bullying and couldn't do much to lessen it. He had a rough past and people were always hurting him left and right. Then, Soraru had entered his life and helped Mafumafu get through his hard times. He even protected him against Mafumafu's bullies. Mafumafu and Soraru meeting had a huge impact for Mafumafu, thus making him understand that he should protect himself more!
I hope this helped a bit :) I also wish you a good day!