On the next Piers Morgan Tonight, the talk show host gets to the heart of what really caused the breakup between Chaz Bono and longtime girlfriend Jennifer Elia.
RELATED: Chaz Bono Calls Off Engagement
The couple broke off their engagement last year following the completion of Bono's gender reassignment surgery in 2010, but the former Dancing with the Stars contestant said that the procedure had nothing to do with the split.
"We just wanted different things out of life," Bono said. "I wanted to live the best life that I could and I wanted my partner to be able to kind of do that with me, and there were deep-seated issues around substance abuse and stuff like that that had been really a problem almost since we first got together."
According to USA Today, Elia is a recovering alcoholic.
RELATED: Chaz Bono's Dancing with the Stars Breakdown?
Bono proposed to Elia on camera while taping his OWN show Being Chaz. They were together for six years before calling it quits.
The entire interview airs tonight at 9 p.m. ET on CNN.