(NSFW) After hearing about this certain event I feel different. Is this normal?

<I’m sorry I only make questions about my problems on this site>

But I’ll be blunt about this because I don’t want to ramble on and make this more confusing than it has to be. So a couple of days ago I heard my mom having sex with this guy see’s seeing. She was in the basement saying the TV down there needed fixing but I pressed my ear onto the floor to hear them since I got suspicious. I obviously over heard them and now I’m fucking grossed out. Of course anyone would be but after I pressed my ear onto the floor and heard I broke out into a panic attack. The last guy my mom dated blamed the beak up on me, even thought he only wanted her for sex. (This isn’t an assumtion. I’ve seen her text messages but don’t want to get into this much) ever since then my mom and I never talked much and we don’t have a good relationship anymore. I don’t care who she sleeps with but I was involved when I didn’t want to be and got hurt the last time. I’m horrified now and I don’t know how to act towards this new guy? After over heaing them I dont even want to masturbate or think about sexual things anymore because I get repulsed. How long do you think this will be for? I don’t even want my mom near me anymore since she only is happy when she gets to fuck some guy. What is some advice to just mind my own business and act normally? Because I don’t know what to do anymore since the last guy.