I agree with u Dhanya,there are some women who can chuck their parent's ,comfort and find happiness even in a thatched hut of their love ...but here Aarushi is not in love with Aman..she is in love with the image she has of Aman... she is mesmerized by his suave and sophisticated manner's ..is bowled by the affluence present in his home ....her love is selfish,materialistic and superficial ...and her extreme reaction stems from her fear of losing such a dreamy life, insecurity and under confidence..
I know a situation where the youngest girl spoiled rotten by her much older three brothers and a sister fell in love with a guy secretly married him at a nearby temple where many like them run to get married. Her family found out tried to get her to break it off but when older sister went with her to tell him she refused to come back to maike and said he is her life and she won't return. Pure chemical reaction after she saw him. The girl actually told her family when I see him I can't walk away from him. She had a child by him, her family was devastated and cut ties with her. The guy was unpud no job, nothing, living off his poor family's support. Once his child was born he signed on to go to Middle East for some job. Got killed there and was sent back in a body bag. Her family finally got her remarried to a distant relative who didn't mind she had a child from a previous marriage. Sometimes things go wrong.