Why does Stewart get angry with simon glass in shattering glass?

Stewart gets angry with Simon Glass in "Shattering Glass" because Simon's manipulative behavior and his ability to control others lead to a betrayal of trust among their social group. Simon's actions provoke feelings of jealousy and insecurity in Stewart, especially as he undermines Stewart's leadership and friendships. This tension escalates as Simon's schemes create chaos, ultimately driving a wedge between them and prompting Stewart's anger.