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SPOILER ALERT CHAPTER 86!!!!
Based on the raws that got leaked on some certain social media. Cirrus saw a video where the stepmother recorded her and his father having sex on the CCTV and she showed it in front of him with no shame. That's one of the spoilers I've seen so far, they didn't share the other context of it.
And to satisfy your curiosity about why Cirrus is in that state, he beats up his mother by holding her in a tight grip on her neck. Because the stepmother provoked him, I don't know why but I think it's connected to the CCTV footage of his father and his stepmother having sex.