Boris Johnson flouted lockdown rules and then lied to Parliament as part of a cover-up. Unable to face the consequences of his actions, Johnson is resigning to avoid scrutiny of his wrongdoing, showing that he was never fit to be Prime Minister. His career of self-aggrandizement and rule-breaking are ending with him slinking away from politics after it all had finally caught up to him.
A vindictive Labour Party, and the Conservatives that have swallowed their lies, have finally gotten revenge on Boris Johnson. It's clear that this Partygate investigation would be biased and partisan, and Johnson was right to step down instead of letting his opponents — bitter over Brexit and his electoral success — try to embarrass him. Johnson was much more popular than any of his Conservative successors, and it's sad to see his party let this happen to him.