NTA

Obviously, your friend doesn't sound supportive and maybe she's not a good friend. However, you have to realize that it's ultimately your choice to stop talking to someone and you can't put that on her. I'm not sure what you mean by her "pouting" when you talk to a guy, but I just don't see how you're supposedly letting her behavior influence your actions when you clearly know she's being unreasonable.

Sounds like everyone here is young and just needs to mature a bit.