I'm reading because I'm enjoying it and like toxic plots sometimes.
But, let's be real here. Everyone is trashy in this including the Beta. He may not have cheated first, but he also cheated and carried on an affair. Also, he physically abused the seme. Sure, seme might've been a cheating asshole, but he didn't even know that yet. Beta resorting to violence - seme so hard he loosens his teeth and bruises his ribs because he said the relationship "was exhausting" is toxic af. No one is innocent in this plot.
The Alpha's Circumstances