There is actually nothing to hide, Priya did not two-time Ram and Aswin, or trap Ram into marriage. The propsal came from Niharika, both Ram and Priya declined at first and then Ram accepted Priya as she is. It is not that Priya went too far with aswin, or some such.
I would like it if it happens this way: Priya comes to know of Aswin's presence, understand Sid's intention and confides in Ram all the details of her past.
Then Priya, with full knowledge of preferably Ram, at least of Vik- Neha, meets aswin in private, lets Sid take the most advantage of it. Later when Sid tries to use it against her, it acts as an eye-opener to Ram as of Sid's true colours.