So, the more I think Mansi, the more I think she is NOT way off. It is Aarti who is. Mansi keeps reminding Aarti to make things clear about her intent to marry. Remember Mansi has no way of knowing what a decent man Yash is. As a friend, she should warn her friend to be aware. Remember the lecherous older guy Aarti's inlawys found for her in the mall that was almost all over her? There are lots more men like that - especially in the category of those that want to marry a divorcee. Aarti however, seems to be unable to make the distinction between a lecherous man and a man who is trying to help her. Granted there have been a few situations like the seedy hotel, the bug bite etc that fall in the suspicious category but isnt Aarti old/mature enough to really analyze his actions and give him the benefit of the doubt or otherwise?
After the wedding, when Mansi talks about give and take - she has a skewed perspective on men (remember Samantha from SATC? )but she does have a point. Yash was nice to Aarti, so what's wrong in Aarti trying to be nice to him. Of course, Mansi's 'nice' has a dirty connotation but Aarti doesnt have to stick to that does she? Its amazing that Aarti does not have that depth. Maybe also because she has no experience with men outside of Prashant who used her for one thing only?
It also seems like Aarti is trying to hide from her own reaction to Yash with the shield of his perversion..so its easy for her to not respond to him. Come to think of it, she should be more worried about telling him the truth about her own state than worrying about his intent.