John Cena and Nikki Bella
John Cena and Nikki Bella called off their spring wedding date. The wrestlers are pictured attending the premiere of “Blockers” in Los Angeles on April 3, 2018. Frederic J. Brown/AFP/Getty Images

As John Cena and his rumored new girlfriend, Shay Shariatzadeh, get closer, ex-fiancé Nikki Bella may be having a hard time dealing with their relationship.

Bella, 35, who dated Cena, 42, for six years, is afraid the couple will get close enough to start their own family– something she always thought she would have with the WWE wrestler, Hollywood Life reported. Bella and Cena ended their engagement in July 2018.

Bella has been vocal about how she feels about seeing Cena with a new woman, using “The Bellas Podcast,” which she does with her sister Brie Bella, as a platform to discuss her feelings.

“ He’s one of the people, besides you, Brie, who’s made me an amazing person,” she said. “But because of how sad and how much I hurt him, when I saw the big smile on his face, I felt happy for him. I am very happy for him. As long as John is happy, I’m happy. ”

Bella is romantically involved with her “Dancing With the Stars” partner Artem Chigvintsev, and recently made it official on Instagram between the pair. But Bella has said on her podcast that she is not ready to make a commitment at this point in the relationship.

She has, however, has warned that Shariatzadeh better not hurt Cena, saying “Let me tell you, she breaks his heart? Wow. I will rack attack her in a heartbeat.”

Bella also doesn’t want to see Cena and Shariatzadeh have children anytime soon as this was a dream that she wanted for her relationship with Cena, Hollywood Life reported.

“Nikki would be heartbroken and crushed if John ended up having a baby with someone other than her as that’s truly the only reason they broke up,” a source for the news outlet said. “She always wanted to have a baby with John and the thought of that happening with a new woman is really hard to digest, but of course it’s crossed her mind.

“She tried everything to make their relationship work and sacrificed as much as she could, but at the end of the day, that was one thing she decided she just couldn’t go forward with. She loves being an auntie and truly can’t wait to have her own children. She’s so maternal and will be the best mom but she’s not putting any pressure on herself,” the sourced added.

Cena and Shariatzadeh were seen kissing each other goodbye at the San Diego airport last week, as the engineer got ready to take her flight back home to Canada. The couple was also spotted out in San Diego enjoying a sunset dinner together last week.