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Didn't read this yet but
The original story of Shakespeare included rosaline a lot , Romeo and juliet were more of satire then romance , he was like mocking how foolish they were
Romeo friends talked about how he was in love with Rosaline just a few days ago and now he loved juliet
Also Shakespeare made juliet really young for a reason 13-14 maybe and Romeo was a lot older for a reason , it highlights how she was easily swayed at that age , at that time some rich old people used to marry young girl, it was mocking them more than anything
If I wrote something like this and someone came and changed my entire perspective and the reason why I wrote it making it the opposite like a beautiful romance story I would be pissed
The movies I have watched never included rosaline or this perspective