"...Many people across Delhi feel that our actions have let them down. In May (last year), we apologised to the people of Delhi for the disappointment caused; and in case you missed it the first time, I do so again - so you hear us loud and clear," he said.
"We did not lie, and we did not steal. However, I acknowledge that people were still hurt by our actions, because what AAP represents is bigger than all of us. People felt hurt that they invested so much of themselves in a party and movement that was seen to have walked away," Kejriwal said writing on the NDTV website.
AAP, which had 28 seats in the 70-member House, ran the government with Congress support.
Later, Kejriwal contested Lok Sabha polls against BJP's Prime Ministerial candidate Narendra Modi from Varanasi but lost.
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He insisted that he had not given up Chief Ministership of Delhi for that purpose, as is commonly believed.
"It's also a commonly-held belief that I gave up the Chief Minister's chair in Delhi to fight the Lok Sabha election and become Prime Minister. I didn't," he said.
Recalling the atmospherics during the last Assembly polls in Delhi in 2013, Kejriwal said, "...Thousands of young men and women in Delhi began something they had not done before. They sat around dinner tables, discussing and debating politics with their family members.
"People in Delhi have always debated politics, but this time it was different. This time they stuck their necks out- vouching for a new political party, often writing out cheques with their hard-earned money."
AAP is seeking full majority for a five-year-term.