What would you do if you realised she was going to be 'the one that got away'?

Been pining over the mistake of ending an on-off relationship about 4 months ago.
I haven't stopped thinking about it and I saw her last week and I'm convinced she's going to be the one that got away.

I hear she's seeing someone new though.
Sappy, typical, I know.
Respect her new relationship and stop bringing pain.
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What would you do if you realised she was going to be 'the one that got away'?
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