How do I deal with a manipulative bully

Problem/Goal: I keep on getting bullied and humiliated. It's really taking a toll on me.

Context: He was my friend, he left the circle because we manage to not let him control us. We're already in college and he's still stuck sa high school set-up where everyone should be friends and living in harmony like it's all rainbows and butterflies eh siya nga itong naninira ng atmosphere. I'm the class president and I get that we should get along with classmates but what he want is for everyone to listen to him. He's always this superior type and keeps on stirring up drama and then later apologizes keme keme. It's also pretty personal what he's doing. Sa friend group kasi namin ako lang ang madaling awayin since wala sa nature ko ang makipag-away. I still kind of cry everytime I think about it. He keeps on calling out every single mistake I make sa gc namin. Not in a feedback way, but in a mapanira way. He keeps in giving these passive-aggressive responses na even majority of the class hates him for this.

Everything's taking a toll on me esp my mental health

Any advice on paano ito matitigil? I don't think maaayos ito ng usapan lang. He's good at faking everything lalo na sa harap ng faculty namin. Now he's blaming me saying that "I want his health to decline" like huh? I don't even talk or do anything to you.

Case? DSWD? What? Just help me please end this.

Previous attempts: talked with an instructor about this but still no proper action.