She's is being protected because people keep justifying her behavior and actions.
Nanase, in fact, is not a good GF and Yuni should have broken up with her but took the worse curse of action.
People are treating Nanase like she has captive Yuni against her will
I'm baffled at how people put Nanase and Yuni at the same level. Yeah sure Nanase wasn't a good girlfriend but what Yuni has done is way worse.
Why she is so protected by the readers?