Something wrong is the wrong word. The relationship came out of balance and so you need to step back and ask: have I not heard you? have I hurt you? have I perhaps been asking too much of myself? It is best to be honest and say: I have the feeling you have withdrawn from me and that is okay if that is what you need.
It is important for Mary to seek an answer and to accept what she hears. Be brave dear. You can do this.