How long before I can ask my girlfriend to give us a second chance?

We’ve been going out for almost 7 months now (not a particularly long time, I know). We live in the same city (London) and share an international background, which is initially what brought us together. We’ve done so much together – trips to cities, 2 trips abroad and we laugh and share great conversations. My whole world fell apart last weekend and I’m just asking myself what I did wrong. She thinks our relationship has plateaud and that we won’t grow anymore. But she still wants to keep in touch. I’m so confused since this has come out of no where and we haven’t even talked about it before. Didn’t see it coming at all. I’m just so distraught and surprised. It’s been a day now and I’m just so tempted to talk to her and ask if we can give it a second chance. But she knows how I feel so maybe I should let her contact me first? I’m leaving the country in a few days just for the weekend and I just can’t bear not knowing if we could work it out or not… Thanks for your comments.