Why does Anne write that she feels bad about her relationship with Peter?

From the text:

No, I think about Peter much more than I do Father. I know very well that he was my conquest, and not the other way around. I created an image of him in my mind, pictured him as a quiet, sweet, sensitive boy badly in need of friendship and love! I needed to pour out my heart to a living person. I wanted a friend who would help me find my way again. I accomplished what I set out to do and drew him, slowly but surely, toward me. When I finally got him to be my friend, it automatically developed into an intimacy that, when I think about it now, seems outrageous. We talked about the most private things, but we haven't yet touched upon the things closest to my heart. I still can't make head or tail of Peter. Is he superficial, or is it shyness that holds him back, even with me? But putting all that aside, I made one mistake: I used intimacy to get closer to him, and in doing so, I ruled out other forms of friendship. He longs to be loved, and I can see he's beginning to like me more with each passing day. Our time together leaves him feeling satisfied, but just makes me want to start all over again. I never broach the subjects I long to bring out into the open. I forced Peter, more than he realizes, to get close to me, and now he's holding on for dear life. I honestly don't see any effective way of shaking him off and getting him back on his own two feet. I soon realized he could never be a kindred spirit, but still tried to help him break out of his narrow world and expand his youthful horizons.