lol, nobody says: "I don't even like this girl, and her personality is garbage, but Im sad she only wants to be friends" if you are sad, then you like the girl, or if you dont like the girl, then why you do care, she only wants to be your friend?
I feel ya OP. I got friendzoned this one time in a similar situation. When I called the girl the next day she told me I'm lucky that she didn't call the police.
Maybe you weren't what she expected. Sub par performance, unattractive facial expressions, weird noises, awkward ending? Maybe she used you for sex and wants an excuse so she can't be called a slut. Stop being insecure.
Exactly- especially when they had sex. If you really don't like her personality- why would you want anything else?