From my understanding, there are 3 types of "friendzoning".
The first seems to be a misguided attempt at a girl being nice to a guy rather than outright blowing him off.
The second is caused by the guy expressing prolonged "friend-like" behavior instead of expressing or even hinting at having "relationship feelings" for her so even if the girl had feeling for the guy at first, she buried them.
Finally, the post-relationship friendzone is an even more misguided attempt at a girl trying to make a guy their friend long after the guy has buried his "friend-like feelings" under his "relationship feelings".
The first seems to be a misguided attempt at a girl being nice to a guy rather than outright blowing him off.
The second is caused by the guy expressing prolonged "friend-like" behavior instead of expressing or even hinting at having "relationship feelings" for her so even if the girl had feeling for the guy at first, she buried them.
Finally, the post-relationship friendzone is an even more misguided attempt at a girl trying to make a guy their friend long after the guy has buried his "friend-like feelings" under his "relationship feelings".