Reason

Not all happy endings got happy beginnings
Determination and resilience can alter the wildest egos
It sure hurts to see a friend turn to a foe, but look at the positive side of it,  it opens a channel of meeting new even better friends.
You need to grow too. drop them too. Your current life status wouldn't accommodate them.
They have made you the person you are today. Times change, people do even for better, there is definitely a reason they have not made to your future.
Every passing day, you make a choice. If your sad you choose to be, Every successful story has a theme of sacrifice. There was a season of sorrow, but never gave up.
You have got to fight on, you need to always put the armor of hope wherever you go