I would beg to differ on that one (that a DG can’t kick you out because they aren’t the ones controlling anything).
Remember, even when you’re lucid, your subconscious still has more power over the dream scape than your conscious self does. Or perhaps I should say that your subconscious simply plays a hugely important part even when you’re lucid.
In his book Lucid Dreaming: Gateway to the Inner Self, Robert Waggoner provides some very interesting experiences about dream figures and the role the subconscious plays while dreaming. You don’t control your dreams when you’re lucid. You control your own actions and direct your focus in a dream. Thus, unexpected things can (and will) happen even if you’re at your most lucid.
For instance, let’s say you simply ask to be transported to a different place. Or heck, even a specific one, such as… I don’t know… a savannah in Africa or something. When you get there, the world will look a certain way, but I doubt that you painstakingly created every single tree, every single animal, every single leaf, every single grain of sand consciously. You provided the focus and the intent, and your subconscious maps out the rest.
Now, I do not know about your relationship with this girl that the dream figure is based on. I don’t think that person was a guide, because a dream guide is basically someone who helps you out in the dream scape. Helps you discover things, become more aware, that sort of thing. Like a mentor. Not just someone you hang around with a lot (though you can certainly hang out with a dream guide a lot).
A dream figure, ultimately, is some expression of a part of yourself. A part of your subconscious, which definitely does have the power to kick you out of a dream. It happened to me a little over a week ago when I denied a dream figure something they helped me with.
As to what this means, I can’t really tell you. You’re the only one who can properly interpret your dreams. Just realize that it may not have been as serious as you may think, as tosxyChor explained.