Oh wow. I just realized Ryuukishi must have planned Erika a long time ago. When I happened to look that poem "Bern" had written as a extra TIPs, this rang a bell quite clearly in my mind. Emphasis mine.
Quote:
Many things were found from his room.
From those evidences, it is possible to deduce that I am loved by you.
Many things were found from my room.
From those evidences, it is possible to deduce that I also love you.
Nothing was found from her room.
However, I can't deny the existence of an undiscovered evidence X of unfaithfulness.
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Or then this was used as the inspiration for the backstory of Erika.