Ah, "The girl is dying, and she's talking to her friend, who betrayed their other friend (who she is said to have liked.)" confused me. I thought their other friend who she is said to have liked referred to 私が好きだった[リュウイチ] part.
So, he is talking to リュウイチ, she loves the role Gackt is playing(maybe?), and リュウイチ betrayed them, right? Then, I think she said that she hoped リュウイチ would return to his former self in the near future in the line 明日…そんなに遠くない明日.