The JLS singer confirmed that he is dating backing dancer Sarah Richards earlier this month.
He explained that he plans to keep partying as much now as he did before his relationship began.
"There's no way I'm going to become boring, don't worry about that," he told the Daily Star.
"I'll still be out just as much as before. After all I'm only 24! Plus Sarah works long hours so it works for her too.
He added: "We are serious, though. It's not just dating."
Merrygold will replace Adam Garcia on the next series of Sky1's Got To Dance.
JLS will release their new single 'Hottest Girl in the World' on October 21.
Watch the video for their new single below: