The more I think of your suggestion that Sameera had committed suicide, the more I think it is a strong possibility. It would also explain why Maan initally used to taunt Geet saying women are weak, they try to escape a problem and do not have the courage to face it, they always rely on a man to take care of them etc etc. Maybe Sameera was a weak character who took her life when she could not handle her problems (whatever they may be).
As to the gold digger theory, it could be that Maan sees through NT and knows that she is a gold digger (he definitely does not like her). Maybe his accusation of Geet stems from his impression of NT.
Agreed.
Nice points. I forgot about how maan used to tell geet how women try to escape a problem and stuff. Now, I think Sameera committing suicide suggestion is a strong possibility.