Loving the wrong person does hurt you. Let her go. She doesn't deserve your heart.
Stop making her feel guilty for not liking you back, feel like she's been hurting you and been doing something wrong to you.
If she made it clear again and again from the beginning that you couldn't get closer to her then stop. What you're doing is no more than acts of torturing her, ignoring her and being selfish.
She told you what she had gone through to help you to understand that what you had/have been doing to her was/is not loving her but destroying her peace.
She doesn't deserve your time and energy, don't waste your resources on total futility.
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"Embrace the glorious mess that you are."