I've been double jabbed and been in close contact with covid positive people without knowing. Never caught it(as far as I know) and test myself every week as a min and when been in close contact confirmed, do daily LFT tests as advised by track and trace. It's about living with the disease but being cautious. The family member who had it last week was 30 healthy and it still was quite unpleasant for him for a week although he had been jabbed once and believed he couldn't catch it as he'd been jabbed!
I'm as careful as anyone gets and had successfully avoided it for 18 months. My wife and I now both have it. It seems that being cautious makes little difference once others give up on keeping their hands clean and wearing masks in public/crowded indoor spaces.