I mostly like it, but I think it needs to come up IN CONTEXT. IN other words, if you just proactively do this, in a vacuum, it will appear to be a "technique," or just pissy.
Now, if she says something like "You seem awfully distant lately, what's up?", and you start the "You know, I've been thinking, and I have decided that -- " speech . . . I think that works mo' better.
