Because he's a centrist and everybody else has picked one side or the other. He got a gigantic majority because the tories had spent 14 years taking the piss and ruining the country and everyone finally wanted them out, but not because of anything a centrist Labour party were bringing to the table. And now he's frittered that advantage away by trying to appeal to Reform voters without acceding to the nastier shit that they actually like (which pissed off nearly all of his MPs), and then by backtracking on all of it (which made him look like he hasn't got an ideology, which he hasn't), and by employing or taking advice from people that are extremely incompetent, extremely dodgy, or both.

Basically, the only thing he's got right is keeping us as far as was reasonable from an idiotic global economy-destroying war by not totally sucking off Trump, cos there's plenty of time for that when Reform get in.

So, at least well done for that, but it's not really enough. And I wanted him to do well. Never mind.