I read the whole thing, and I still think he didn't feel like he did enough, because she couldn't stop acting like a slave, because he couldn't pay enough money

I read the whole thing, and I still think he didn't feel like he did enough, because she couldn't stop acting like a slave, because he couldn't pay enough money to send her home once he was an adult, because he couldn't turn his back on his parents over what they did to her. I get the feeling he felt very guilty, even as an adult, and was trying to confess (shortly before dying, interesting).