Have you tried to contact your ex girlfriend multiple times and every single time that you do, she seems to be unresponsive to you? If she is acting like she would really rather not be bothered by you right now, maybe you should take that as a hint. I don’t want to be the one who rains on your parade, but sometimes a little does of cold, hard truth can be a good thing. The reality is, if your ex girlfriend is unresponsive to you right now, then maybe you should back off right now. That does not mean that she is going to always act like that or that you have to just write her off as someone from your past. What it does mean is that you need to be prepared for the fact that as much as you may want to get back with her, that may not be what she wants right now.
Of course, feelings can change. What she feels like today is not necessarily the way that she is going to feel like tomorrow or the next day. What I would recommend you to do is to find something other than her that makes you happy right now. That could mean that you find something to keep you busy, like a goal or a hobby. Or, that could mean that you may need to expand your vision a little bit to see that there are plenty of women out there that you may like to date. You don’t have to think of it as trying to replace her. Hey, you don’t even have to think of it as if you are trying to have another serious relationship. You could just have some fun for a little while and test the waters of the dating pool a little bit and be casual about it.
As much as you may wish that things were different, if your ex girlfriend is clearly giving you unmistakable signals that this is not a good time for you to try and win her back, then you really should just respect that. It may seem like the worst possible option for you right now, but in time, you may look back and see that it was actually a good thing. You might either meet someone new that you fancy even more than your ex girlfriend. Or, you may find that all your ex girlfriend needed was a cooling off period and then she wants to see where you and her stand. That can open up the door of possibility for you getting back together with her. That door is not going to have a chance of opening up if you are constantly pursuing her and she is constantly trying to put up a wall to shut you out.