<human>: My girlfriend is amazing. We've been together over a year and we know that we want to spend the rest of our lives together and have openly spoke about plans to do so. She is from overseas and I am open to the idea of moving back to her home country. For the couple of years or so she wants to stay in my country. 

We got on to the topic of holidays and places to go, and that's when the mood turned sour. We spoke about a place that she knows my ex and I travelled too, and my girlfriend just closed up and has been pretty much silent for the last 24 hours. I've reassured her that it was all in the past, all decisions have brought us together and that it's just about our future together. She said that she needs some time to breath. 

Ladies of Reddit; what can a guy do best in this situation? I want to give her the space that she needs, but I don't want to go radio silent and seem like I don't care.

Give me the gist of the text in a nutshell
<bot>: My girlfriend started thinking about my relationship with my ex, and has gone radio silent freaking out. What can a guy do?