i think that after they finally get together & head back to Mumbai Sam should let gunjan know the truth as to why his parents don't live with him , why he doesn't talk about them to anyone & why he once said that only he is worried about them in a moment when he was caught off-guard
this will perhaps reveal why Sam was initially drawn to gunjan; the coolest dude in college to a demure girl, from a small town; who silently would hide behind her books & wouldn't talk to anyone fearing anyone new she meets
this will perhaps bring out a part of Sam where he may have found her as a reflection of his true self hence making him wanna go all out of his way to help her thou only on the pretext of a bet with Dia initially
may be this will bring out the real Sam who no one knows about , who amidst being a whole gang of friends is still lonely as he himself said to nupur in the new year party thinking it's gunjan ; bringing out the truth of the loner in Sam , the most popular dude of the college & why he said that gunjan is his true friend for having seen in him the truth behind the bravado he puts up with his uber confidence & cool dude attitude, a guy who has may be lost a great deal on the personal front behind the star player , the champion of the college who always wins