Since you are still living with her, I might considder TELLING (not asking) her how much. Make it real. You have nothing to hide. You are an open book. You have made plans and now you are carrying them out. No drama.

Once you are apart, then secrecy is probably in your best interest. Just my $0.02 worth.

M:37
W:34
M:4 years
T:6 years
No Kids
A disclosed - 9/1/2010
W asks for separation - 10/19/2010
Moving on - 10/24/2010
A ends (and I believe her) - 12/2010
Content - 3/1/2011
Served - 3/18/2011
D Day - 6/20/2011