feeling depressed and feeling rejuvenated when meeting someone from the past is this:
If meeting person/persons from the past stress you and evoke feelings of unhappiness or sadness, raise complicated thoughts and negative reflections, remind you of slaps in the face or being turned down, or bring up memories of instances when you were rebuffed or made to feel small, then this is reliving the past and any further meetings with this person or persons should be avoided. We don't need to spend our energy dealing with hurts...
However, if the person/persons you are meeting bring in happiness of shared memories, laughs, a feeling of companionship and camaraderie and the atmosphere is convivial, then this meeting is a trip down memory lane.
Why I'm making this distinction is because one does come up against the past... people we've known at various earlier stages of our life do suddenly make an appearance. One comes across references to people and events that were probably responsible for changing the course of our lives.
We need to know if we are -
reliving the past ------ debilitating
or
going down memory lane ------ invigorating