Well, if he is doing this bcoz he thinks Sonakshi is responsible for breakup, then he probably forgot what things he had told to Sona before leap.. About her not being able to pay loan, not becoming a mother/good mother...
As for precap, Well, I am ready to believe he is pretending to be a flirt/ Casanova... But did he change this image suddenly after seeing Sona.. Maybe, but then certain instances may not suggest so.. Like Golu saying no hanky panky.. 😆😕
Anyway, well it's Dev's life, his choice.. But he is bothering Sona now which seems odd..