Their world doesn’t revolve around to only you, they have their own life to attend to so never ever beg for attention.
People will leave you behind, intentionally or not, but whatever the reason may be, let them. Do not chase people.
They cannot give you the same amount of care you can give to them so stop caring too much.
We must accept the fact that certain things will not last for a long period of time, learn to let go and learn to set them free.
People will always have something to say to you, they will talk about you, judge you, criticize you, belittle you and disappoint you, in short, people will drag you down, so learn to not give too much fuck.
You will go through a lot of pain while dealing with everyday craps, sometimes all you want is to give up. Hold on. Be strong enough to stand alone.
In some point of your life you will get tired, empty and lonely, then you will find someone whom you can lean on to, someone you think will always be there. Avoid over-attachment. Don’t give your all. Do not trust too much.