The one referred to as 'her' in this part is a completely different character: 'She 3'
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It wasn't going to hurt because I wasn't looking for anything in return,
Or so I thought, because what I felt that day was unexpected.
It hurt that day.
It shouldn't hurt but it did and I knew why right away.
I didn't want to believe in it though,
I was bound to a promise that I had once made to myself about falling in love,
So, I wasn't going to believe in what I felt.
During my search in your head to solve the puzzle that was you,
I had found reasons to fall for you,
But these were my feelings, and this was my problem, not yours,
So, I let them be.
I wasn't going to let them be a burden to you,
Because I knew you still missed her.