With the news of their shocking split released late Sunday, all eyes have turned to John Cena and Nikki Bella's relationship timeline to try to make sense of this breakup. The Total Divas pair was set to tie the knot at the beginning of next month, but Cena and Bella announced their split on April 15, just weeks before the May 5 ceremony, which according to People had been planned to take place in Mexico.

With such a last-minute cancellation, many are understandably blindsided by the news. After all, it wasn't just the wedding that was called off, but the WWE couple's entire relationship, as Bella revealed in an Instagram photo which appears to be text screenshotted from the iPhone's Notes app. "After much contemplation and 6 years of being together. Nikki Bella and John Cena announced today their decision to separate as a couple," she wrote in the brief post. After that explanatory sentence written in the third-person, she added what seems to be a more direct statement from the pair themselves:

"While this decision was a difficult one, we continue to have a great deal of love and respect for one another. We ask that you respect our privacy during this time in our lives."

It's a jarringly brief way for this couple to end six years together, and the brevity of the statement and abruptness of the announcement has fans reeling, wondering if there were signs they'd missed. Ultimately, no one can know exactly what went wrong, except for Cena and Bella themselves, but their relationship timeline does give a few hints that marriage might be a loaded issue for these two. Take a look.

2009-2012: John Cena's First Marriage Giphy It may have been an entirely separate relationship, but by Cena's own admission, his first marriage to his high-school sweetheart Elizabeth Huberdeau has had a lot of bearing on his thoughts on marriage. (So stay tuned for that.) TMZ reported that the relationship ended because of tensions that built up over the couple's remodeling process, and that Huberdeau accused her wrestling beau of infidelity, a claim he fought, as it reportedly would have nullified their prenuptial agreement. According to Life & Style, they ultimately settled their disagreements out of court, but the terms remain confidential.

2012: Bella & Cena Started Dating Matt Winkelmeyer/Getty Images Entertainment/Getty Images By 2012, Pop Sugar reported that the pair had already known each other as friends for many years, after meeting through WWE. But right after Cena's divorce, he finally got up the nerve to ask Bella to dinner, and the two began dating soon after.

September 2013: Bella Meets The Family WWE on YouTube The new couple took the next step into their relationship when Cena introduced Bella to his family during the mid-season finale of Total Divas. The 34-year-old more than held her own with the rowdy Cena family, and it apparently made the wrestler comfortable enough to advance the relationship.

November 2013: The Move-In WWE on YouTube Just a year after they started dating, the WWE couple was set to move in together. But even though the relationship was moving quickly, Cena still felt burned by his previous relationship, and was maintaining very strong boundaries. As he revealed in an episode of Total Divas that was quoted by Maxim, the 40-year-old made his girlfriend sign a contract just to move in. And not a short one, either. "I had to have [Nikki] sign an agreement to live in the house," he told the outlet. "And that's-it wasn't a one-page, it's a 75-page agreement." He revealed that the decision was based not on Bella's behavior, but on how things ended with his previous wife, and wanting to protect the family members he supports.

2016: The Hard Line Matt Winkelmeyer/Getty Images Entertainment/Getty Images He'd already expressed similar opinions on Total Divas, but in a 2016 interview with Rolling Stone, Cena took an even harder line on marriage, saying he'd never be comfortable walking down the aisle again, let alone in having kids. He said, "Look, I know I cannot handle raising a child ... Just because everyone else is happy with children doesn't mean that's how I have to live. I've been upfront about this. I just have things I need to get done. It's not negotiable. We've been to therapy over it. I don't think it will ever be over with. I'm stubborn as f*ck and extremely selfish as well. I don't want kids, I don't want marriage. That's me just saying, 'Hey, this is my life and this is how I'm going to live.'"

2016: The Reversal DivaDirtTV on YouTube In Season 5, Episode 2 of Total Divas, however, Cena suddenly reversed himself. He'd clearly been giving Bella's wants and needs a lot of thought, and at the couple's three-year anniversary dinner, he revealed that he'd come around on the idea of marriage and would "love" to marry his longtime girlfriend.

April 2017: The Proposal The Bella Twins on YouTube However, during the broadcast of Wrestlemania 33 on April 2, 2017, Cena did what he said he'd never do, and got down on one knee to pop the question. Obviously, the answer was a resounding "yes."

Late 2017: Dragging Their Feet Dia Dipasupil/Getty Images Entertainment/Getty Images In October, Cena and Bella shared with People that they'd had to push back the date of their wedding, and in November, seven months after the public proposal, the couple revealed to Us Weekly that they were just beginning to wedding plan. They attributed both decisions to their busy schedules, and planning moved forward.

Early 2018: Hints Of Trouble Alberto E. Rodriguez/Getty Images Entertainment/Getty Images Previews for the upcoming season of Total Divas showed Bella tearfully asking if the wedding was off, and it left fans with questions as well. And in a February 2018 appearance on TODAY, Cena acknowledged that the couple was having issues, but said things were still on track, telling Hoda Kotb and Kathie Lee Gifford: "I think in relationships, you have highs and lows, and that was an extreme low. You have two choices. You either jump ship and start a new relationship, or move forward and try to work through it. We're gonna move forward and try to work through it... I believe we both have some work to do, and we're genuinely trying our best to work through it, so I'm very happy to say that it's in a situation that we're working through. We haven't yet jumped ship." It's that "yet" word that would come back to haunt them.