Complex sentence: She realizes now how she must have hurt Kyo's feelings very badly, so she reveals to Kyo that the reason why she "loved" him was because she wanted to feel better about herself and believed she could wash away the selfishness by loving him.
Split into simpler sentences: She realizes now how she must have hurt Kyo's feelings very badly. She reveals to Kyo that the reason why she "loved" him was because she wanted to feel better about herself and believed she could wash away the selfishness by loving him.