I'm sorry about the pain you are going through. I had a recent break up too where I was going out the person for about four months (he broke up with me, feeling that I was getting too attached. He said I "deserve better," since he has been going through the process of a divorce and has anger/drinking issues).

I have found so far that a No Contact period works since you will both be able to clear your head, and your partner will be able to let go of some of the negative emotions. It'll be like a fresh new start, and you might find that your girlfriend misses you and contacts you out of the blue. It doesn't have to be anything formal like a "30 Day Rule," but maybe a week or two to cool off. My ex ended up contacting me after a week, frantically worried about whether I was mad at him. I was friendly and assured him I wasn't, then went back to a little more space. Then, a few days later, he was still worried about what I felt about him. We talked, and he said he wants to see me, although his life is crazy right now. Basically, that will give your girlfriend the chance to miss you and realize she doesn't want to lose you, even if that means taking it slow again.

I don't want to jump into anything serious, but I miss him and have been wanting to see him. It was clear that the little bit of space worked, since we were able to have time to see past the negative, and he reached out after he was proven that I can live without him. Distance really does make the heart grow fonder, plus it gives you some time to heal no matter what the outcome will be, since that's of utmost importance. Be patient with yourself. It will all be okay no matter what.