There is no one reason as to why relationships end, but here is a bit of advice that may help you to get back with your ex. Obviously you may need to alter what you do slightly to suit your situation.
What is crucial with any break up is to spend some time away from your ex. This time can be used by you to think about how you both got to this situation. It may seem like the last thing that you want to do after you have just broken up with someone, but it is the best thing you can do.
This will give you time to become used to the idea of being away from your ex. It’s very common for people to become desperate when trying to get their ex back. But with some time apart, if your ex does not contact you, you are more likely to overcome the need to resort to desperate measures.
After this time it is time to for you to make contact. Try to keep everything calm and casual when you speak with them. Try suggesting a simple meeting somewhere public as friends.
You should give it up there and then if they decline, as this means that they have moved on with their lives. It is a big advantage though if they agree, this means that they admire you for giving them space.
When you meet them make sure you look great, they need to see you at your best. Don’t focus the main conversation around your relationship either, just subtly mention it
You should be able to read the conversation and tell when is best to bring it up. It might not happen on the first meeting, but this doesn’t matter, you are on the right track. There is much more advice like this on get your ex back tips you should take a look.