Let it unfold
I was taking an English lesson with a non-English native teacher.
During the lesson, she said that when you fight with your boyfriend or girlfriend and want to say "Let's not talk about this" or "Stop talking about it, you can say "let it unfold".
I could't find this expression on my dictionary and if I think about the meaning of "unfold", it's hard for me to connect it with "stop talking about it".
Does it really mean that? And if so, how can I image the meaning of this expression?
If not, what does it mean and how do people use this expression?