Didn't play the recent update yet but, with how close Alex and Isa have become, I think that too much attention is being given to preparing the throuple, while cutting any of the girls out for a solo relationship a player might desire is gonna be too painful.
The solo path for Alex is probably the hardest.But yeah I get your point if you don't want anything to do with Alex as a LI , Val is probably the better option when you take Alex's feeling into consideration. Since this update is about them getting closer and being friends. I might be wrong here but I think either the next update or when chapter 5 starts ( not sure if chapter 4 is done or not) is when it's going to go back to a focus on the story plus solo relationship building im guessing.
For now she had to be at the MCs house, first Cath wasn't around, now she's pissed at her.
She will be still there if you reject her, but not as much as she was.
Building a friendship will not help her to cope with breaking up, but it will give her a chance to accept Isa as a solo LI.
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That's it for chapter 4, and yes, chapter 5 will be more Isa background and story progression.