Ten years after the referendum that pulled Britain out of the European Union, a poll throws cold water on the whole story: most Britons now think Brexit was a mistake, and as many as two-thirds of EU citizens would take them back. A divorce both sides are starting to regret.

The survey, carried out across 15 EU countries, shows 66 percent of respondents support Britain rejoining the bloc, with backing ranging from 56 percent in Bulgaria to 75 percent in the Netherlands and Denmark. On the other side of the Channel, the picture is even gloomier for Brexit's champions: Britons cite damage to the cost of living (66 percent), the economy (65), opportunities for young people (57) and trade (56).

The most telling part is on free movement - the very thing many voted to leave over. Now 63 percent of Britons would accept free movement in exchange for closer trade ties, including 57 percent of those who voted to leave in 2016. When people are ready to take back exactly what they rejected, that's not a change of mind - it's an admission that the promises were empty.

Politicians flung the doors open at once. France's Macron said "the doors are always open," Spanish PM Sánchez said Spain would "without hesitation" back British membership, and Finland's Stubb added: "We really need Britain's voice in Europe." Whether that's sincere regret or a diplomatic wink is hard to say.

For us in the Balkans, who have spent years waiting at the door of that same Union like at a council counter, the story carries a bitter irony. Britain went in, went out, and is now thinking about going back - while we're still waiting to be let in for the first time. Maybe the biggest lesson of Brexit isn't for those who left, but for those watching how easily the rules change once you're already inside.