Personally, I just interpret it that William has wallen madly in love with Lucinda, and she controls his life completely, using all his money, which seems to have been an ample enough amount, but that this isn’t enough for her. She really want to control him. He’s been trying to forget about her on his journeys, but he still loves her, and despite the fact that he know he shouldn’t, he keeps coming back (the whole Lucinda character can arguably be interpreted as a drug addiction, but I don’t see it that way).
I think it’s actually Lucinda who commits murder, and framed Williams, or that she’ll get him to do it. Therefor he becomes the crown heel of her sin.
Personally, I just interpret it that William has wallen madly in love with Lucinda, and she controls his life completely, using all his money, which seems to have been an ample enough amount, but that this isn’t enough for her. She really want to control him. He’s been trying to forget about her on his journeys, but he still loves her, and despite the fact that he know he shouldn’t, he keeps coming back (the whole Lucinda character can arguably be interpreted as a drug addiction, but I don’t see it that way).
I think it’s actually Lucinda who commits murder, and framed Williams, or that she’ll get him to do it. Therefor he becomes the crown heel of her sin.