Does Brutus ever have a chance to tell Portia about the assassination plot in Julius Caesar.

Portia, Brutus's wife in Shakespeare's Julius
Caesar appears in the latter part of the first scene of Act II.  After
awakening, she becomes aware that Brutus has "stole" from her bed.  Remembering how he
suddenly arouse at supper and walkied around with his arms folded as he sighed, Portia
wonders what it is that troubles Brutus.  As revealed earlier in this scene, Brutus has
wrestled with his conscience about the act which he contemplates.  For, while Caesar has
not yet displayed any truly tyrannical behaviors, Brutus feels that he is
like

...a
serpent's egg,

Which hatched, would as his kind grow
mischievous (2.1.30

Brutus
concludes after listening to Cassius and the others and reading the forged letters
that because Caesar may become corrupted by power, he must be prevented from possessing
this power. However, when Portia asks her husband why he has acted as he has, and begs
him, "Make me acquainted with your cause of grief" (2.1.267), Brutus merely tells her,
"I am not well in health, and that is all" (2.1.268)   Of course, Portia does not
believe him, saying that he would not come out into the night air if he were
ill:

You have
some sick offense within your mind,

Which by the right and
virtue of my place

I ought to know of; and upon my
knees

I charm you, by my once commended
beauty,

By all your vows of love, and that great
vow...

That you unfold to me, your self, your
half,

Why you are heavy, and what men
tonight

Have had resort to
you....(2.1.285-291)

Portia
even cuts her leg to prove that she is strong and can keep her husband's secrets.  But,
just as Brutus is about to reveal to her his motives, Luciius and Caius Ligarius knock. 
So, he tells Portia to go in and

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...by and by thy bosom shall
partake

The secrets of my heart.
(2.1.318-319)

After the
men arrive, Brutus accompanies them out, and then the events of the assassination
occur, dire events that result in a civil war. Brutus has lost the opportunity to reveal
to Portia his intentions before the fateful day that Caesar goes to the
folum.