"A few weeks ago, I displayed a strong lapse in judgement - but let me be clear - nothing happened between me and my costar," he posted to the social media platform.
"I drank way too much that night and I regret my behaviour. I should have known better. This is not the example I want to set for my son."
“I apologise to my amazing wife and family for putting them through such an embarrassing situation, and I am focused on being the best husband and father I can be.”
“This was not that,” he added.
After Justin's confession, Jess opened up and a PEOPLE source shared how the mum-of-one feels and why she's sticking by her husband.
“He’s charming and outgoing. And obviously he drank too much this time, but Jessica believes he didn’t cheat on her."
"She will stand by him,” they added of Jess, who married Justin in October 2012.
An additional source close to Jess told PEOPLE that the pair will “work through this."
"It was good that he apologised publicly but obviously the real work he is doing is in private and hopefully this was just a bad drunken night of this type of behaviour," they told the publication.