So this should be easy to predict. He denies her because he knows she'll pass on but won't tell her that. Then the other guy will slide right in and put the moves on the rejected and dejected fmc.
The thing with Haruki is she is not acting purely out concern for Aya. She's doing what she is because she's jealous the girl she likes is being taken by someone else, even worse for her it's another woman. Going into Aya's phone to contact Kuro was straight stalkerish. As of right now Aya needs...
@emmebi86 Even she is her best friend the fmc doesn't have to tell her everything. She deserves her own privacy. Maybe the friend should said something about how she felt beforehand and she wouldn't be in this position. Her feelings are on her, not the fmc.