It's complicated to me

She has a hard outside. But, for whichever reason it is, I no longer even see it. She opens up her soft inside spontaneously and all the time with me. That just doesn't feel right. I feel her vulnerable. It is confusing because she has a hard outside, and it is a little disturbing because I don't want to feel myself "preying" on her vulnerability. I do like the whole, but, but, I don't like to feel like she drops all defence on me. I'd much rather think I am only a pleasant distraction. I don't like the thought that she cares about me. Even though I know she does.