Sid was so angry at Cindy as he suspected her of betraying him and then trying to put the blame on his wife. Cindy was so scared stiff at seeing how angry Sid Devon at her that she doesn't know how to refute his words of accusations. Her original plan to frame Sid's wife backfired on her.
As Sid saw the fear in her eyes, it only makes him believe that she really betrayed him. He approaches Cindy slowly with pure killing intent in his eyes. In his mind, Cindy may not only betray him, but she also may cuckold him with another man and was scheming to break his marriage so that he would become dependent on her and would believe everything she said.
Actually, Sid Devon is not the only man in Cindy's life, but she would never dare to betray him as she already put all her hopes on him. She even dumped her current boyfriend for Sid.
