This girl is immature, and is not being honest with you. Trust in not really there anymore which would be a good reason to leave already but on top of that if she is not able to communicate whe you talk to her that is also a good reason to leave her. Communication is key and if she gets annoyed when you guys discuss something or reacts pissed of and takes drastic actions (change her number), how can you deal with this for 2, 3, 10 years.
Dump her and do not look back!!