A times some people just need to leave our life, though the memory of the things shared together in the past kept the persuasion of staying, but seem the end that would justifies the means is given a red light, while should those memory becomes a driving tools for the connections.
We relates will everyone but not everyone are meant for us.
Not everyone comes to stay, some comes to inspect, correct, rebuke, construct and do any of the short term assignment destined by nature but when its time for them to leave, emotion and the memory of the things shared in time past will never be capable of holding them back.
They don't join the enemy line but just on a different line though, that line was a parallel one.
Move on with your line, see such as a challenge, that those who leave are out there watching you either to give kudos or other wisely.
it a nice things be around co-visionary.