A relationship breakdown is not uncommon, but finding the initiative to try and get your ex girlfriend back certainly is. A lot of people tend to just give up. In fact, they might put in a tiny bit of effort before giving up. This might be in the form of a quick text or maybe if they push the boat out, a quick phone call, but really - is that going to work? You need to show you're ex girlfriend that you are serious, not that your bored without, more like that you really want her in your life, there is a huge difference and she will be able to see it even if you don't think you can.
It is hard, I know. You probably go to bed thinking about her, you possibly even dream about her and the first thing you do in the morning is look over to see an empty space in the bed. Remember that not all of your relationship was good, its just when you split up with someone, that is all your mind lets you focus on. Because it has become a habit and routine, your brain does anything for you to want it back.
You probably need some kind of outside help if you want to get your ex girlfriend back within 7 days. I'm not talking about reading a few tip lists on the internet either. They are a complete waste of time and you should be using your time more productively. Instead, purchase a couple of e-books or guides and you'll soon find that you have a more positive state of mind, which will certainly help you get your ex girlfriend back!