✔ 最佳答案
Quit over thinking this. It will happen when it happens and if he wants to surprise you, go with the flow. Remember, you aren't the only invested in this relationship. And if you're going to marry him there will be compromises.
My point is, even if you're "nervous" don't let that take away from the joy your future fiance wants to propose. When you are distressed by not knowing when and how, it tells me that you don't like it when you're not in control. GO WITH THE FLOW.