Separation

Separation doesn't take place with only one person being at fault. It is always about both of them. When you decide to part your ways with them, you don't do it just because they hurt you, you do that because you know hurt them too. You may not do it intentionally but you too hurt people in some way or the other. I know it becomes hard to accept that you are no longer friends with them but if they are doing great without you, you should just leave them. If they are happy without you, you should just let them. I think, that's the least you could do for someone who was once important to you. I know once the chords are broken, they don't get attached and even if they do, there's always a knot. But try forgiving people, try seeking forgiveness from them. It will make it easier, for both of you, may be.