It seems I tend to leave behind the people associated with me in different phases of my life. I am unable to maintain contacts therefore. Any way out?

Contacts, be it just contacts or my friends, are I figured, essential. But I am unable to maintain them somehow. From my achool, my college, you name it. They just get discontinued after some time.

How do you at least keep most of the contacts active?
It seems I tend to leave behind the people associated with me in different phases of my life. I am unable to maintain contacts therefore. Any way out?
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