How do you know when it's too late and you've lost your chances of getting back with your ex (Obv apart from them starting to date someone else)?

I wish I knew if I had a chance still or not? I dont get how you would know if it's too late and it's all history
How do you know when it's too late and you've lost your chances of getting back with your ex (Obv apart from them starting to date someone else)?
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