Actually, something we tend to ignore, probably because we don't want to face the possibility with a character we really like, is that Chris was suicidal. He admitted as much to Joe. And if events did come to pass where Chris was faced with the fact that he had killed Sabrina (who, like it or not, he did love), I can see where that could have been the catalyst to finally push him to go through with it. Chris would have certainly considered Amy, but something tells me he would have ultimately decided that, even though he deeply loved her and he would be leaving her alone, Amy would be better off without him. That was a sentiment that he had often expressed, so it would be completely in keeping with his character. And being confronted with the fact that he had killed the woman he loved would have most probably driven that belief home to Chris all the more.

Chris was suicidal. He admitted as much to Joe. And if events did come to pass where Chris was faced with the fact that he had killed Sabrina (who, like it or not, he did love), I can see where that could have been the catalyst to finally push him to go through with it. Chris would have certainly considered Amy, but something tells me he would have ultimately decided that, even though he deeply loved her and he would be leaving her alone, Amy would be better off without him. That was a sentiment that he had often expressed, so it would be completely in keeping with his character. And being confronted with the fact that he had killed the woman he loved would have most probably driven that belief home to Chris all the more.