Still, that doesn't mean we can't take a moment to remember the good times.
The two met in 2005 after being paired for a special performance on CMT's 100 Greatest Duets special. When they hit the stage to sing their rendition of Shelly West and David Frizzell's "You're the Reason God Made Oklahoma", sparks flew.
"I've never had that kind of experience with anybody," Shelton said during an interview for VH1's Behind the Music. "I was a married guy, you know, standing up there going, 'Man, this shouldn't be happening.' Looking back on that, I was falling in love with her right there onstage."
Yes, Shelton was actually still married to his first wife, Kaynette Williams, when he felt his intense connection with Lambert. Although the couple say they didn't get together until after his divorce, we now know this moment paved the way for their high-profile marriage.
It's a bummer Shelton and Lambert didn't last, but we'll always have the music.
Click above to watch Blake Shelton and Miranda Lambert's heartfelt rendition of "You're the Reason God Made Oklahoma."