AS YOU WELL KNOW, Ruka is just an emotional mess, and will be doing her utmost to hide it, but Yusei will absolutely be able to read her like a book anyway. Whole lot of pain and despair in her heart, so best of luck with that.

He is also totally allowed to hack into her private communications (which I'm going to go out on a limb and say includes her IC contact post stuff if he's in the mood to hack her text messages (or... eavesdrop through apartment walls puts face in hands)), just give me a head's up if/when you want to do that so I know to expect it!