I agree with the last post! People take breaks to realize what their true feelings are for someone. If you're able to be over it in a few days, then it really isn't love, but if it takes forever then it is.
I was in a relationship a few years ago, the guy & I had been on & off for 6 months or so, it seemed like every few weeks we were taking a day or two break. We always ran back to each other. We were very confused about our feelings. Finally, we broke up for good. He more less told me the same thing you said in your post, he didn't want to break my heart if something happened down the road. I couldn't eat, sleep, move, nothing for waay over a month! I talked to him a few months later & he wanted me back, I said no because I was with someone else & I couldn't take the heartbreak with him again. I didn't want to be with anyone else, I wanted to bad just to run back to him but I knew I couldn't. One thing though, he still has a spot in my heart and I will forever love him, but we will never be back together!
What's happening with you is just testing your relationship with the both of you. If you love her or you don't. In the end you will make the right choice for her. More then likely if you can't get her off your mind or function right, you will end up back with her. Good luck, I know it's tough but you will make it!