Tess gives birth to Alec s son Sorrow who soon dies Later in the story Alec returns in Tess s life to make her suffer more He pretends to be a religious man He takes advantage of Tess s poverty and makes her his mistress This ends Tess s final chance of happiness Angel s Responsibility Angel also hurts Tess deeply He leaves her when she needs him the most When Tess tells Angel about her past with Alec and Sorrow he thinks Tess is no longer a pure woman He says he cannot live with Tess anymore as husband and wife He says Tess is now a different woman no longer pure You were one person now you are another This is unfair because Angel also had an affair with a lady In the end Angel realizes his mistake But it is too late Tess kills Alec to return to her loving husband Angel Hence though both Alec and Angel are responsible for Tess s death Alec is more responsible Alec rapes and starts her suffering Tess's suffering never goes away after that Tess s death is the result of the cruelty of Alec Angel and the society itself