You can’t keep in touch with everyone in your life from the time you were born through to primary school, secondary high, college, university, working; you get the idea. You’re bound to let some people slip through the cracks of your life. These we call the ‘touch-n-go’ phenomenon. There are a number of reasons why this phenomenon occurs, some of which you may not want to admit but it’s true. You can ask yourself why this happens and there’ll be a gazillion excuses but the main reason is neither you nor the other side cared enough to keep in touch.
It honestly does not matter how close you were at the time. “Absence makes the heart grow fonder“? Nah, realistically, “out of sight out of mind“.
“No distance of place or lapse of time can lessen the friendship of those who are thoroughly persuaded of each other’s worth.” Robert Southey