If jassi has lost her child so has arman who had so many times warned her of taking care but she was careless with respect to her child .On top of that,jassi's father accuses him of not being able to stand on his feet so he had to prove himself.Notice the dialogues carefully ,he said i have a few faults in me which i want to remove and i want to win all that i lost on my own and then i will return and take jassi with me to my house.He is doing all this to win back gm for jassi and to make her happy and give her happiness.
He is not an idiot but a lover who wants to give happiness to jassi (who in her utter carelessness lost their child) .She did work for arman but no one forced her to srrain herself and starve and stress herself out .
jassi ran away from the mandap when all arman asked her was a question and she didnt even face the world,she ran away without informing her parents who had dto face the brunt of the society
there is a vast difference between the two incidents,arman told this to everybody that he will return after proving himself worthy of giving happiness and taking care of his wife jassi
all i can say is-đđ