Adam Levine says he "crossed the line" by sending "inappropriate" messages to a woman outside his marriage but did not have an affair.

The 43-year-old Maroon 5 frontman and former "The Voice" coach denied cheating on his wife, model Behati Prinsloo, in a post Tuesday on Instagram Stories after Instagram model Sumner Stroh said they had a year-long affair.

"A lot is being said about me right now and I want to clear the air. I used poor judgment in speaking with anyone other than my wife in ANY kind of flirtatious manner. I did not have an affair, nevertheless, I crossed the line during a regrettable period of my life," Levine wrote.

"In certain instances it became inappropriate; I have addressed that and taken proactive steps to remedy this with my family."

"My wife and my family is all I care about in this world," he said.

"To be this naive and stupid enough to risk the only thing that truly matters to me was the greatest mistake I could ever make. I will never make it again. I take full responsibility. We will get through it. And we will get through it together."

Adam Levine denied cheating on his wife, Behati Prinsloo, after model Sumner Stroh said they had an affair.

Stroh made the allegations in a TikTok video Monday.

Reality TV World is now available on the all-new Google News app and website. Click here to visit our Google News page, and then click FOLLOW to add us as a news source!
"Essentially, I was having an affair with a man who's married to a Victoria's Secret model," she said.

"At the time, I was young, I was naive and quite frankly I feel exploited. I wasn't in the scene like I am now, so I was definitely easily manipulated."

Stroh shared screenshots of purported Instagram messages from Levine and said they were "seeing each other for about a year" before they stopped talking "over a period of months."

She said Levine then came back into her life by sending her a message in June.

"OK serious question. I'm having another baby and if it's [a] boy I really wanna name it Sumner. You ok with that? DEAD serious," the message reads.

News broke Sept. 6 that Levine and Prinsloo are expecting their third child together.

The couple married in July 2014 and have two daughters, Dusty Rose, 5, and Gio Grace, 4.