Dev gets to drink and becomes alcholic he loses his cool and does irrational things.
He regrets saying the words after his spat with Sonakshi.
What is the use?
Every time before the breakup, his mother puts in the condition before the breakup either it is her or Sonakshi.
Everytime before the break up, He takes his mother side.
Everytime before the break up, he takes a vow that he wont leave her side and would be with her. He then proves her wrong.
Every time before the break up, there are a flashback scenes.
Everytime after the breakup, they both cry.
To conclude, Har jaam Devakshi ke naam