Talk to her as a brother. Think of yourself as a child and hold her. Your situation is similar to mine. The difference is that I am my sister and always regard him as my brother, and I don't think about anything else. We always keep in touch. He is a girlfriend now, and I have a boyfriend. Let's keep in touch and don't think too much. Just like at first, you can talk to her when you are in trouble. Try to contact her more. You can go back to the old one.