Devdas returns to the family home and discovers that his sister-in-law has stolen his mother's keys to the family safe. He confronts her but Kumud tells his mother that Devdas had stolen the keys. His mother believes her and Devdas leaves, banished. Paro arrives at Chandramukhi's brothel, accusing her of driving Devdas to drink, but quickly realizes that Chandramukhi loves Devdas. Paro urges Devdas to stop drinking, but he remains stubborn. He promises Paro that before he dies, he will come to her doorstep one last time. Paro invites Chandramukhi to a celebration of
Durga Puja at her husband's home and introduces her to her in-laws without revealing Chandramukhi's profession. However, Bhuvan's ill-natured son-in-law Kalibabu, a frequent visitor to the brothel, reveals Chandramukhi's background and tries to humiliate her in front of the guests, but Chandramukhi reveals that he is the one who visits her place and the reason why her brothel is still successful. She slaps him and leaves disheartened. Kalibabu tells Bhuvan and his mother about Paro's relationship with Devdas. As a result, Bhuvan permanently forbids Paro from leaving the mansion.
Eventually, Devdas becomes so ill that the slightest dose of alcohol could kill him. Devdas tells Chandramukhi that she must let him go, and decides to travel the country; on a train, he meets his old college friend Chunnilal, who urges him to drink in the name of friendship. Devdas drinks, knowing full well it will be fatal. On the verge of death, Devdas travels to Paro's house to honour his promise, collapsing under a tree in front of the main gate. When she finds out that the man who is lying outside is him, she runs through the mansion, attempting to reach him. Bhuvan sees this and orders the servants to shut the gates. Devdas sees a blurred image of Paro running towards him, but the gates close just before she can reach him, leaving her sobbing inside. Devdas whispers Paro's name with his last breath as he slowly dies, and immediately Paro's lamp flickers out.