My friend lies to me?

[Angela]

I'm 13 and I've been friends with her since 1st grade(We're in 7th grade now). We've been best friends for a long time, but I don't know if I trust her anymore. She's always lying to me and stealing my things. I've always forgiven her, but now it really bothers and hurts me. A few weeks ago she found out the password to my phone( I didn't tell her what it was, and I don't know how she knew what it was). She went through all of my pictures, contacts, texts, social media, etc. She's lied to me so many other times and I don't know if I should be her friend anymore. Please help?
I've tried talking to her about this before, but she keeps denying thats she's lying and stealing.