I'm sure the reason for his heartbreak is the fact that she's died, and not the reason why she died.
Yes, she died because of the drugs, yes, I'm sure he had feelings of guilt and wastefulness, but the overriding feeling is surely heartbreak for the loss of somebody who he shared his life with.
As much as I don't condone the cowardly act of suicide, I do understand the heartbreak that could lead to somebody thinking they have no future and they will never see happiness again. But life sorts itself out, and maybe, just maybe he killed himself because of the endless comments being aimed in his direction by people who have no idea about his life or his feelings. Maybe the curtain twitchers killed him