Sometimes you just don't know how bad they are plotting against you. If the fire or light has died, don't try to rekindle it.
Just accept it and keep moving on.
Going backwards will only hurt you in the long run and will cause you harm. People remove themselves, don't add them back and don't accept it.
Just keep moving on and remember, there is nothing wrong with you. They ran their course.
No matter how close you were, nor who the person was there was a reason they left.
You never will truly know someone and it doesn't matter if you think you do because you don't. Wolves can only hide in sheep clothing for so long until it shows itself.
They could be talking bad about you or saying bad things and then suddenly, they are removed from your life. Jealousy is a key factor.
Don't be afraid of cutting people out of your life either.
We are always growing and learning sometimes we outgrow the people we use to be friends with and that use to surround us.