In an interview with Extra, Nick revealed that he's not purposely holding anything up. He simply explained that certain things just take time. That's all.
"There’s nothing to tell… the media has a problem of sensationalism... me and Mariah get along great, and it’s a process, nobody is holding nothing up. Why would I hold it up? I want her to be happy,” he said.
You can tell that he still has a lot of love for MiMi, too. “She is such a beautiful spirit, and we put the kids first,” Nick admitted.
Hopefully, this "process" can be sped up in time for Mariah's wedding with her billionaire fiancé, James Packer.