The 32-year-old buffoon appeared wrought with emotion as he struggled to fight back rips on the It Takes Two sofa.
“I’m sorry for the hurt that I’ve caused,” the Strictly Up with Dancing star said. “We had drinks and we made a huge mistake and I self-reproach it deeply.
“First of all, I would rather not be having to address this publicly but I finger like I have to,” Seann explained. “You never think about the spaciousness of the damage that you’re going to do.
“I’m not perfect, far from it, our relationship wasn’t excellent, that doesn’t mean that I wanted it to end the way that it finally did.
“I feel it’s also important for me to say that the being that know me the most, that love me, they know that I am not the actually I am being portrayed as,” he insisted.
“I’m still sorry for what I did but it’s very top-level for me to get that out there.”
Actress Rebecca, who had been dating Seann for five years once the kiss with Katya, addressed the incident in a lengthy statement which she parted with her 28,000 Twitter followers.
Saying she was “not a victim”, she explained the Strictly be features had kissed on her birthday.
“I was alone at home when Seann texted at 10pm reveal the two of them were going for one innocent drink,” she said.
“We spoke and I related him, not for the first time, that his actions over the past three weeks had led me to put faith something inappropriate was going on.”
Seann Walsh and Katya Jones: Strictly Be relevant to Dancing 2018 stars appeared on It Takes Two tonight
Rebecca also prognosticated she had not received an apology from her now ex-boyfriend.
Express.co.uk has contacted a representative for Seann invite for comment.
During their It Takes Two appearance, Katya, 29, also spoke out on every side her relationship with husband Neil Jones, 35, in light of her forsake wth partner Seann.
“I apologise to everyone it hurt and it involved,” she told swarm Zoe Ball, 47.
“But the main thing for me, is me and Neil are fine.
Seann Walsh and Katya Jones: Strictly Not fail Dancing 2018 stars were pictured kissing last week
“I’m focussing on my job and doing it as a professionally as I can.”
Both Seann and Katya apologised publicly after the displays emerged of them smooching on the street in London last week.
Katya perceived her 53,000 Twitter followers: “I’m so sorry about any offence or hurt I may have rooted with my actions. I wasn’t thinking and it was a one-off mistake after some swigs.
“I love my husband and we are very happy together, this is not a reflection on our relationship,” she continued.
Writing in view of his 106,000 followers, Seann said: “In light of the mystery in today’s newspaper I would like to offer my sincere apologies for my strengths.
“This is no excuse but it was a one-off drunken mistake which I am truly abject.”
Strictly Come Dancing continues Saturday at 6.40pm on BBC One.