Regarding ' going dark '.........I personally have problems keeping people in the background and contacting them as I need them......feel like I'm using people, so not necessarily a sign of being immature? It is mature to consider other people's feelings?.....just a thought to consider?
If it is a long term friendship that is built on mentoring, well I see that as a great part of the friendship, so it is expected, acceptable...a friendship that is built on common interests etc I see that as different.