Indeed. The way the MC perceives Elena and treats her, coupled with how he can be in a love relationship and how happy with him a girl can be, makes Elena get attracted to him more. These two paths have run parallel.
It is possible, but a lot of important content that brings you closer to Elena is lost in that case. And as peculiar as it may sound, the way to Elena's heart is through your feelings for Layla. It all will go too far and eventually the tipping point will come. I don't think we're going to have a threesome or anything like that. Nyx has made it clear what polygamy can lead to. And polyamory isn't available as a kind of relationship. If you're a lovesick, then you'll have to sacrifice someone.
In fact, you're going to make a choice in favor of one of them. How will this affect their friendship? Will Layla regard this as a betrayal on the part of her best friend? How will this generally affect communication between the three of them? That's what's really intriguing about the upcoming plot development...