If you broke up with Layla in the last episode then the only reason in MC's mind is Elena. You might not be wanting Elena but the way you've played the game then MC is wanting Elena, that's not a problem with Nyx's writing, that's you getting too close to Elena when you didn't want her on that route. On the ASR MC is still oblivious to Alexis wanting him and because he had been pursuing her sister up until the last update hadn't been looking at Alexis that way other than acknowledging to himself that she's attractive.
Nikki and Cara are not living in the same town, there are going to be updates where they don't feature, that's to be expected. There's been no indication that Ximenia and Gianna are even going to be available. Ximenia is all but confirmed to be Val's mom and so she knows that her daughter is attracted to the MC, if we consider Adrianna in the same position, she's shown no interest in being with MC at all.