Just mostly copying my post from MAL:
Hmm... So she's basically dating her boyfriend in her original world simply as part of her obsession with normal, not due to her own feelings. Considering this and her dream about Kazumi, it's quite likely that she would indeed fit better in this world, while this world's version's inability to find a partner could change with boys entering the equation as well and lead to a much happier relationship between her and our Marika's boyfriend. Marika's original situation honestly feels like what could have been Yuu's future in Yagate Kimi ni Naru, had she accepted her middle school friend's confession, looking for a storybook romance with the opposite sex, not realizing where her heart would eventually find the real thing.