The Angels Descend Only by the Command of Allah
Ibn Abbas (radi Allahu ahum) reported that the Prophet (sal Allahu alaihi wa sallam) said to Jibril, “What prevents you from visiting us more frequently?” Thereupon was revealed the Ayah: “(The angels say:) ‘And we (angels) descend not except by the Command of your Rubb. To Him belongs what is before us and what is behind us, and what is between those two.” (19:64)
This Hadith tells us about the Prophet’s desire for meeting the angel Jibril to have that knowledge which was revealed to him by means of Wahy (Revelation).
It also tells us that angels descend to earth for certain missions by the Command of Allah. They have no say of their own in any matter. It also indicates that it is permissible to enquire about Muslim brothers after a long period of time as this is a sign of true love.
And Allah Knows Best!