When people come to you and you like them as who they are. You'll manage your time to be with them and make happy memories.
When the friendship becomes deeper challenges will also come. Having harf time to be with because of busy schedule or something that needs to become your priority.
But, the most hardest thing is they need to leave you because of their situation to improves themselves.
Then suddenly, you'll feel empty again because they left you. You can still be friends and talk with the use of technology not in person.
The difference is when someone is far its possible that they will forgot about you., vice versa Even though you are friends. They will meet friends have similar characteristics to the one they left.
You'll notice the friend you left when you remember them and talk when there's chance.
Well, we all know that its part of reality tbat people come and go. So everyone should bear with it even though its hard.
It's only my opinion about this kind of topic
Be happy that they've been with you for a while because some people that leaves you helped you to become strongerso you can handle things alone. That's my opinion.