Seeing your own friend dying by your own hands was not something that anyone could just simply come in terms with.
It was definitely no joking matter.
Yet Greg was forced to live with this kind of experience for the rest of his life while having a keepsake of that incident next to him. Always reminding him of that painful and dark history of his.
It was not that Greg was being a hypocrite when he claimed that he did not kill anyone.
Nor he was not feeling any bit of remorse to himself after what he had done to his good friend, Harold.
In all honesty, it even made Greg lived a life of agony throughout his days above because he simply could not get over that specific night.
It just so happen that he somehow managed to get used to the pain over time, that was why he was able to get his life moving forward as though nothing in his past was holding him back.