I empathise with you.. I'm going to have to do the same talk in 2-3 months as well, if I don't get a new job. And I am really really scared about it, since I'm in the middle of "the mess" right now. But mine is a very recent relationship so I don't expect anything like this.
Whatever you may choose to do she's there, she cares a lot and it must be a good feeling to know that.