Potia is less flattering then Calpurnia because the way Portia liked to act and her role in the play wasnt very womanly like.
Like Calpurnia, Portia is also a very humble and obedient wife. However, since Brutus is also a conspirator who is under a lot mental stress because of his plans to assassinate Caesar his relationship with his wife is strained and tense. The obvious reason being he cannot reveal and discuss the finer details of the conspiracy with his innocent wife Portia.
This tension is palpable in Act II when Portia on bended knee begs of her husband to know the reason why he has not slept that night. Brutus offers evasive replies, and fortunately for him Ligarius, whom he had sent for, is heard knocking at his door.
Brutus hurriedly asks Portia to leave saying that he will reveal everything to her later, “and by and by thy bosom shall partake/The secrets of my heart…Leave me with haste.” And she being the obedient wife does so.

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