I know it's hard but people will go.
Sometimes the most trusted one and sometimes someone whom you loved so much and sometimes when even living without 'em will be so difficult but you have to survive and breathe.
It's difficult but give space and time to yourself and you need to understand, in this journey of life you will get to meet so many people and not everyone will stay and not everyone will be there for you always.
You have to remind yourself of the times when you didn't have anyone in your life and you were still happy and didn't rely on anyone to make you Happy and nothing was able to make you sad right.
Understand the importance of being with your ownself and using your capabilities and being just you.
I know it's hard but it possible, you can and I believe in you.