Stefani filed for divorce from the fellow singer, with whom she shares three sons, in August 2015 after 13 years of marriage and a 20-year relationship, reported E! online.
Stefani and Rossdale finalised their divorce last April and agreed to joint physical and legal custody of their three son- Kingston, 10, Zuma, 8, and Apollo, two.
"We had 20 years together and that in itself is pretty incredible. It's a lifetime. I still think she's incredible.
"It was a lovely 20 years and we have three amazing children. There were a lot of positives, and with time they'll become more and more obvious," Rossdale said.
"For me, it was about being solid for them, and silent but respectful of Gwen. That's what I'll be forever," he added.
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