What can my brother do to get his ex girlfriend to accept his proposal?

My older brother is 29 and the woman he's been with for 4 years is 27. I don't know much about their relationship but do know they started living together on the 6 month of their relationship and the girl broke up mid Nov 2023.

My brother accepted his mistakes. He didn't cheat but admitted that sometimes he failed to keep his promises. He really means it this time. He has already apologized and proposed twice (just this Dec and just last week) but she declined him both times. I've never seen him this down and really desperate. He hasn't eaten much and didn't even show up to work today.

He really wants her in his life. He told me himself he's would move forward with the wedding the next day if she says today. He's really sorry about everything and will be the man she always wanted, make her happy, give her kids, etc.

He does means it all but she declined him twice. What can he do to get her to accept his proposal? Is there a way he can change her mind about it?

What can my brother do to get his ex girlfriend to accept his proposal?
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