The Quickest Way To Get Your Girlfriend Back - This Will Shock You
The tendency, when a breakup happens is to plead your case. Do some begging and make promises that will only make your ex more determined to end the relationship. This lowers you even farther in her esteem and will do nothing to change her mind.
You want to reverse things, make her the one that is being dumped. How do you do that? By agreeing with everything she says. Smile and be sympathetic to her. When she gives you that old stuff about needing space and time to think, tell her that you agree and in fact you had thought about telling her but you were afraid of hurting her feelings.
This will cause her to think 'what's going on here'? Who is being dumped. Now you have reversed things. She doesn't want to be dumped but the only way to avoid it is to get back with you.
Now, you have to hang tough. Have no contact with her. No phone calls, emails or text messages. Make her contact you first and when she does be cheerful, tell you hope she is doing as well as you are.
If you can, go away somewhere for a week or two. When she can't contact you, she will realize how much she misses you. When you next talk to her she will probably want to arrange a meeting to talk. Delay it for a while. Be polite and tell her you want to talk, but right now you have too much going. The longer you make her sweat the stronger your position will be when you do get back together.