live in the past

blast from the past

Something or someone that a person has not seen for a long time that evokes nostalgic feelings.

ghost from one's past

Something unpleasant from one's past that "haunts" them (makes them feel uneasy) to the present day.

live a lie

To conceal something about oneself, without the knowledge of which others cannot know one's true character or perspective.

live and die by

Be completely reliant upon.

live and let live

To be tolerant; to enjoy the pleasures and opportunities which life offers and to allow others to do the same.

live beyond one's means

Have a lifestyle where one's spending regularly exceeds one's income.

live down

To cause others to forget about something embarrassing that happened to oneself.

live in sin

To cohabit as if husband and wife without being married.