One of the behaviors taken by men who noticed the feelings of women is that the reply to question LINE is delayed. To think that you want to reply late. It is a bargain.
It is a proof that the woman is worried about in the other way.
In the midst of this bargaining, it will be disliked at once when LINE is thrown in series as if folding. Even if you do not have a reply, let's refrain from taking action.