Why Girlfriend goes cold but still initiate conversation?

Usually we have deep conversations.She has said she loves me.texts me hearts and kisses,calls me honey.and wants me to be her first.But sometimes she goes cold on me when texting,and I usually do the same if she acts cold and I start to act uninterested too. Then she tries to initiate conversations and shows a bit interest. If she went cold why is she trying to keep conversations? Why the hell is she acting like this(she does this quite alot)