why did prachi n milland break up

LEAP - 5 Years Later

The scene shifts to five years later, where Prachi is shown to be living with Proteek and his family. Through flashbacks it is revealed that Panchi had died in the bomb blast. Proteek honoured her last wish by inviting Prachi to stay with him and his family. Prachi accepted his offer seeing as she had nowhere else to go. When they arrived at the Dasgupta household, Prachi was assumed to be Panchi as nobody had met the real Panchi before. Proteek requested Prachi to pretend to be his wife as his ailing father wouldn't be able to bear the shock of his daughter-in-law's death. Back to the present, Proteek and Prachi have been pretending to be a couple for the last five years. They're raising two children - Suprateek (Proteek and Panchi's son) and Sumonto (Milind and Prachi's son). Proteek has secretly fallen in love with Prachi and hopes that she'll reciprocate his feelings someday.

On Sumonto's birthday, Prachi gifts him a gold chain she had made for Milind. Sumonto, being his usual naughty self is chased by Tanushree Dasgupta, Prachi's elder sister-in-law. Sumonto falls from the terrace and hurts himself badly. He has to be hospitalised. Prachi fails to arrange for blood for Sumonto and is shattered. When she comes back, Proteek tells her that a person has donated blood to Sumonto. Prachi wants to thank him personally and goes to his room. Although she cannot find the person, she finds a locket having her and Milind's picture. Prachi is convinced that Milind saved their child's life and runs after him to meet him. But she remembers Mallika's warning and restricts herself.

The nurse from the hospital calls Prachi up and says that the man who donated blood to Sumonto is at the hospital and wants his locket back. Prachi rushes there but misses him and finds out that he left with a social worker named Sushmita Chatterjee. Later on, she meets Sushmita, who reveals that she runs a rehabilitation center for people who're alone and distressed. A completely shattered Milind is shown sitting on the floor of a room in the rehab center, clutching Prachi's picture. His appearance is extremely shaggy and unkempt.

Prachi reaches the rehab center to meet Milind only to find out he has left already. Meanwhile Proteek meets with an accident on his way from Bhuvaneshwar to Kolkata and Milind saves him and brings him back to Kolkata. Prachi sees Milind but hides herself from him as she is in a dilemma to choose between her love Milind and her responsibility to Dasguptas. During his stay, Milind begins to bond with Sumonto. After he comes face to face with Prachi, she explains why she's living with the Dasguptas, and that Sumonto is his son. She urges him to keep their relationship a secret, but he vows to get his wife and son back into his life."