There is a time to come and a time to go. To me it sounds a healthy choice but not only that. It's also a sign of love to let go of someone so you both have a chance to grow and develop in someone you would like to be around with.
In my experience life is a journey and we gather the information we need to develop but we also always meet the same people unless we break the circle.

If it's meant to be you will meet again. I let go of many to be with me and the friends I have aren't few but that's fine since I have to live with me and like everyone being born and dying is something we do do alone.