I shouldnt judge because the same thing happened to me about five years ago, was about 2 hours early for my flight at Gatwick, sat around in departures for ages and because it was a Ryanair flight thought they wouldn’t board until at least half an hour before take off. Got to the gate 40 min before and the smug staff guy was ‘sorry we only send two buses out to the plane and they’ve both gone’. Was quite embarrassing having to be escorted back through security.