The Client List actress said earlier this month that she would love to date the Maroon 5 frontman and Voice coach, though she later apologised for the comment.
While Levine said that he was "flattered" by Hewitt's interest, he confessed that he found the move to be "aggressive".
Writing on her Twitter page on Friday, Hewitt expressed her regret over the incident, writing: "The moment when you make a comment about something or someone and the world makes you feel like a total fool.#keepcrushesquiet
"Thank you to @adamlevine for being so gracious on Ellen about my crush heard round the world. I've learned a lesson.#Sssh"
Levine ended his two-year relationship with model Anne Vyalitsna earlier this month, and is reportedly still heartbroken over the split.