hi,
I can sooooo relate to this. I have had numerous "best" friends, only to have fallouts months or weeks afterwards and we wind up never speaking again. It hurts and I get tired of going through it. I am far from perfect and the prayer i hope encourages you. God has shown me a lot of what I need to change about myself. Be at peace.
Father,
Help this person to be a blessing to those around him/her. Abba I ask that you show this person what they need to do to have friendships that are pleasing to you and give this person revelation as to patterns they need to break in order to get those friendships that are desired.
In Jesus name
Amen