What are common reasons for friendships to fall apart?

What are common reasons for friendships to fall apart?


Betrayal? Moves away? Jealousy?

I had 2 friendships that had to end.
I was in a toxic friendship where she had her nice and helpful moments but also really rude ones. She always tried to boss me around so this "friendship" ended after highschool.
The second one was my best friend as a kid. She lives in the same building as me so we lived really close to each other. However as we grow older her arttitude changed dramatically. Drugs, fuckboys all over the place and violent behavior. I tried but couldn't help her so we lost track of each other.

Do you have more reasons why friendship could fall apart or any experience why you had to end a friendship?
What are common reasons for friendships to fall apart?
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