I caught my mother having sex with a guy in my college that i hate

There's this really hot guy in my college who I've always hated, he's just plain retarded... to everyone, not just me.

One day I fainted at school at the very last class, some guys and girls stayed to make sure I was fine, he stayed too, then everyone went but he stayed too ( nice gesture to be honest, but that doesn't change anything, I judge a person on how they act most of the time, not on a single occasion )

I was waiting for my mother to come pick me up at school. I noticed immediately that he was attracted to her, my mother kind of looks like Taylor Swift also and she's pretty young, and I noticed my mother gave him some weird smiles.

I casually talked about him and mentioned his looks. I'm not jealous of him at all as my mother gave me her good genetics, but I mentioned his looks and my mother replied '' naaah, he's not hot at all, too much of a baby face... you look 10 times better than him ''

Then I started telling her about all the stupid things he does, he can't bully me because he isn't better than me in any aspect and he knows it but he tries to be a cunt anyway. Then we were forced to work together at home, we're in the same classes most of the time! What does he do? He calls my mother beautiful and my mother starts smiling like a 15 year old girl who has a crush on a guy. Then he leaves and she says '' I was being kind '', and no I didn't bring it up. It was the very first thing she said when he left.

Long story short: one morning we were waiting outside, he decides to skip class and I do the same to follow him. Basically he went to my house, I walked in silently and saw my mother giving him oral sex, I heard him talking to each other like two lovers and I heard my mother commenting on '' his beautiful cock '' and saying things like '' I want it more often ''

( the doors in my house have very small '' windows '' )

I left the house silently and I have always acted like I have no clue but I casually still get mad, the guy can say he fucked my mother, apart from the fact that cheating is cheating, I would be way less mad if she did that to any other guy, not the one I don't like.

It just shows she doesn't care she made herself and me look stupid. I made things sound worse than they were, but this doesn't matter: she thinks he's bullied me and that didn't stop her anyway.

I really have no specific question, any advice in general is accepted.