Doherty is participating in the popular "Love Your Spouse Challenge" on Instagram at the suggestion of her good friend Sarah Michelle Gellar
, and on Tuesday, she shared a stunning flashback shot of her wedding day five years ago. The happy couple is holding hands in the romantic photo, with the former Beverly Hills, 90210
star glowing in her wedding gown and dramatic veil.
"Our wedding was exceptional and not for the big event it was," Doherty, 45, writes. "It was exceptional because we committed for better or worse, in sickness or in health to love and cherish one another. Those vows have never meant more than they do now. Kurt has stood by my side thru sickness and makes me feel more loved now than ever."
"I would walk any path with this man," she adds. "Take any bullet for him and slay every dragon to protect him. He is my soul mate. My other half. I am blessed."
"My marriage was always strong, but it's made my marriage a thousand times stronger," Doherty said. "He's never missed a chemo. He's never missed a sick day."
"I could not have gotten through this without my husband," she added.
Doherty also revealed Iswarienko's emotional reaction when she told him she had cancer.
"[He] hugged me and said, 'We are going to get through this. You are going to be OK. We are going to get through this, you're strong and you're powerful and you're not going anywhere,'" she recalled to ET. "'You have so much to do in your life. We are going to get through it as a family.'"