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Chapter 43: Just when he thought that he had “won” and escaped his mother with Bum by his side, he met that lady. He even said that he “never wanted to see you again”, tried to brush her off, but visibly failed to do so despite his efforts to look unbothered whenever Bum was around. You can see that he didn't raise his voice at Bum in the previous chapter where Bum made a lot of mistakes, but he did in this one after meeting that lady. It was obvious that Sangwoo was very shaken by the doppelganger. That's how deep the trauma was for him that even his stability—Bum—couldn't help.
Chapter 44: In this chapter, Sangwoo's longing for maternal love was clear. He tried to convince himself that the lady and his mother were the same, but the lady's devotion to save her son, much less her own, made Sangwoo envious. I think this chapter is the clearest depiction of Sangwoo's longing and envy, or could I say, his childish side. His decision to kill the lady was his way to win again, but it appeared that his trauma was bigger that he hallucinated and at last escaped to Bum—the stability he found.