No one was able to understand why people acted the way they did in the book. Hamlet in the book was not able to tell anyone exactly what he was feeling. There was so much going on that his mind was in such a messed up state. This is Ophelia too, she couldn't tell anyone why she was so in love with Hamlet it's just the way she was.
It isn't fair when you know a simple thought from them could rearrange you. All that remains is the hope that somewhere along the way you discarded a stronger more vivacious version of yourself. A fragment to be called upon when you have nothing left.