Sounds like the second one you mentioned enjoys the attention, and with regards to the first woman, 2 emails isnt a lot, and she could have done the decent thing and let you know shes decided not to take things any further, but (and please dont take this the wrong way) at the same time, if they were quite detailed, then maybe she knows it wont go anywhere and doesnt want to waste anymore of either of yours time.
Dating sites can kind of become hard work, and so after a while you dont want to put your energy into something you know isnt going anywhere so just concentrate on the ones that might.