If the Sex and the City revival taught us anything, it's that even the closest friendships can fall apart.
Just like Carrie lost Samantha, so many friendships have come to an end in real life.
This happens for a myriad of reasons: jealousy, toxic behavior, and drifting apart, to name a few. Thankfully, there's a lot that can be learned during these hard times.
Here, 19 people share the upsetting lessons they learned after a friendship ended.