IMHO, don't send the text, but do start detaching/going dim now.
GAL behave like you don't need her.
Be friendly, be kind, treat her like your sister.

Extra words won't help or change the sitation or her lying.

BITS
Me-51, WAS-52
Kids 2
M-26yrs, H.left 2009, 2 more Bomb drops, Reconnection spring 2013
Change is inevitable, personal growth is a choice.
Love is a action and choice you make, every day.