I remember waking up after the referendum and being really sad, the UK was an ally to us Danes on most EU-issues, and it felt a little bit like a breakup. I still haven’t really forgiven you lot, to be honest, which is silly but true.
I think most Europeans felt that, because after all the uk was a founding member and an integral and valued part of the union with an unprecedented amount of preferential treatment. When they left it was a bit like your partner leaves to fuck some homewrecker for a couple months before they realize how good they had it, but it’s ruined now.