I have been talking to this girl more than I month, we were pretty close at one point. We used to text everyday and phone call sometime. We were like bf and gf but she completely changed about two weeks ago. She push me away and seems cutting me off. And said she is not ready for anything new even she used to call me bf. Whatever I try to approach or stuff she refused and now she doesn't really reply my text and I feel like a completely stranger to her.
What can I do?