Jack Osbourne opened up on the grieving process he experienced after his 2019 split from ex-wife Lisa Stelly. On the Sunday, February 18, episode of Kelly Rizzo’s “Comfort Food” podcast, Osbourne admitted the “toughest time” in his adult life was when he was going through his divorce. “Way harder than dealing with the MS,” he said, referring to being diagnosed with multiple sclerosis in 2012. “Way harder than getting sober.” “It’s a huge grieving process,” he added. “It’s the death of something.” Rizzo chimed in, “And I feel like people don’t think about that as much, that can be just as stron…