The 32-year-old country star opened up about her split from the 39-year-old singer for the first time in an interview for the January issue of Cosmopolitan. Lambert and Shelton were together 10 years, ending their four-year marriage in July.
"We were together for 10 years, married for four, were very quickly divorced, and are friends," she told the magazine. "I'm still processing everything and figuring out where to go and what happened. [Marriage is] a tough business, and we gave it our best college try."
Shelton has since started dating singer and fellow The Voice judge Gwen Stefani, whom he reunited with this week after spending Thanksgiving apart. Lambert is also reportedly dating casually, and said single life has been difficult at times.
"I just want to live a life full of everything," she said. "I don't necessarily want to know that I have really bad, long, lonely nights ahead of me, but I have had some, and I still have a bunch ahead of me. But it's about living in the moment and feeling every tinge of pain, then waking up the next day and going, 'All right, I'm going to ride my ponies. I'm going to have a girls' night.'"
Lambert has leaned on friends like fellow singer Ashley Monroe since the split, while Shelton's fellow Voice coach, Christina Aguilera, voiced approval for his new relationship in November. Lambert asked fans to support both herself and Shelton in the interview, instructing, "Nobody pick a side -- because there ain't a side."
Lambert last released Platinum in June 2014 and completed her accompanying tour in October. The album debuted at No. 1 on the Billboard 200, the star's first to top the chart, and includes the singles "Automatic" and "Little Red Wagon."