Darnay dines with Sidney Carton after the trial. Why do you think Carton behaves as he does? (Book 2 Chapters 1-6)

Carton resembles Darnay and its because of this that Darnay is acquitted. Carton orders wine more than once do drown his sorrows. He is bitter, rude and jealous to and of Darnay. In his drunken depression Darnay says ,"I care for no man on earth, and no man cares for me."