I've heard that its good to 'agree with the breakup' if you want to get your ex back.... is this true?

There are some people who say a good way to get your ex who broke up with you to actually want you back is to tell them you think it was a good idea that you broke up. Apparently it in some ways itmakes them feel rejected and guys always want what they can't have or it makes them jealous/curious. Do you guys think that's true or think its a good strategy? I'm really unsure about it... any advice would be appreciated!
I've heard that its good to 'agree with the breakup' if you want to get your ex back.... is this true?
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