I completely understand Arman's insecurity and ego. What was he supposed to do , he gave his position and his company to her and now she is acting all high and mighty , challenging him to make her the CEO, refusing to sign the cheque, questioning his decision. The guy who is the son of the man who made GM with his hardwork and who is used to being the leader suddenly finds under someone and that too under the person he gave a job, status and everything when no one else was willing to.
Jassi emotionally blackmailed him to get the CEO post and is not acting like a boss ignoring the guy , showing no respect to the guy who made her what she is today. On top of that , she is best friends who almost bought the company with Aryan , what else was he supposed to think.
yes he is a jerk but his insecurity and his jealousy is well justified.