While I hate to sound corny, perhaps walking away make help your girlfriend find a little perspective.

I personally don't believe having a break helps as if you can't work it out while you are in it things aren't going to get any better being apart (avoidance if you ask me). However, that said, it does not mean it that it wont work for you.

It sounds to me you are still in love Unbroken or perhaps it is just disappointment that you thought you found something but it ended up being different to what you had thought.

Whatever the outcome, take care!