Should I even acknowledge that I know she is planning to move out? It might not even been 100% true.
Of course not. There is nothing to be gained. Remember she is an opponent to your M right now. Don't share intel with your opponent. She has now lost the element of surprise in her move. That gives you time to prepare and not break down when/if she follows through. That may be worth something or nothing. But revealing that you know will just cause her to plug the leaks.
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Am I wrong to act on emotion right now? Should I initiate a talk tonight?
While you're DB'ing trying to work on your M, never act on emotion. The best choices are made rationally. And stop talking; she's not listening.
And asking her to "move out sooner" - what does that accomplish? You are trying to tell her what to do. Learn to state your actual boundary (what you won't tolerate) without telling her what to do. There are pros/cons to have her living with you. If you think she's already planning to move, it will happen soon enough, there's no need to hand her another example of you trying to tell her what to do.
And more important than telling her you plan to move on is showing her (without telling her) that you are moving on and will be just fine.
-zew
Zew stole all my thunder -- nothing remains to be said. This is all spot-on, 1foot. ^^^