“You never forget someone you've loved once.”

     https://joan-reese.pixels.com/featured/thinking-of-you-joan-reese.html?newartwork=true

Make as many friends as you can, but don't build your life on them alone. It's an unstable foundation. 

Some people are going to leave, but that's not the end of your  story. That's the end of their part in your story.