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Nah, I think he's just very different from her. She's straightforward and law abiding whereas he's manipulative and essentially a criminal. Not to mention that they hint to him being a player. So it think he's both attracted to her naivety, and feels like he's kind of tainting her, y'know?
Like he sees her trust in him, specifically him himself, as stupid because he "knows" that he's a bad guy, but also feels obligated to not break her trust. He knows he could really mess her up, but doesn't want to.
Tl;dr: I don't think he meets genuinely good people that often and now he's getting intrusive thoughts.
chat why dosent he want her to trust him so much? is he gonna kill her or smth???