According to Dr Blumberg, there is indeed a correlation between the time it takes someone to text you, and their strength of feeling. It almost makes you pine for the days when people would send. So to eliminate that problem he just sends you a text. It will minimize the need for a long drawn out conversation that he may feel is pointless. It could also save him from what he feels is some incessant nagging that he knows is about to come. So he simply will use text messaging as his shield.