Look for new friends, branch out. I'm sure there are lot of girls who want to dump on someone about their relationship troubles. You sound like a great dumpee! Use it to your advantage.

Definitely sounds like you could use some better friends, I'm sorry she's using you like that 😔 as someone who's therapist literally told them to make friends, I understand how much of a challenge it can pose 🙃 been contemplating joining a D&D group in my town - if you enjoy stuff like that there might be local places near you that could offer an opportunity to form new bonds. Best of luck regardless!

That is no friend