Well I do understand Chie being scared of trying to move things along since they might go badly and she's just happy with how things are playing out, but that's exactly what gave rise to this problem, if you were going out you wouldnt be so insecure about this type of stuff.
It is pretty interesting that Ayano and Miyoshi were thinking that Chie was the one that had made the doll, and that they consider they're already dating.
Ai just doesn't put so much thought into that type of stuff I feel.