TBH if I were in Blondina's shoes, I would also misunderstood Amon's behavior and intention. We know why Amon is avoiding her because we're the readers but in Blondina's perspectives it might seems like Amon is feeling uncomfortable and avoiding her.
Well I'm not surprised that Cain find Aria alluring considering that he spend most of his time in the academy and never see or been in contact with her. Regardless, I find it repulsive though...
Can someone spoils me if Aria will accept Asher's confession anytime soon?