If they had said "u cant take ur eyes off the person" she might had realized, since is the most obvious part after u fall in love with someone. What u feel might be completely different for each person and circumstances, but wanting to constantly look at them never changes.
Well, at this point is too late for Aya i think. She had him closer in the past and always pushed him away. Now, he dont seem to have eyes for her anymore. Tho, the only hope is the fact it wasnt mutual when they started dating, he simply accepted her confession.