These add to his perceived charm, the speed, and intensity of his pursuit. If he plasters your Facebook page with compliments, flattery, songs, and poems, they text you dozens, if not hundreds of times per day.
They will block you for different reasons, and the number one goal is to elicit control over you and make you submissive. This is also their way of showing just how little you mean to them. They do this to mess with your head and leave you in complete panic and distress.