Are things really over for good? Fans were heartbroken when they learned that Total Bellas stars Nikki Bella and John Cena split just weeks before they were set to walk down the aisle back in April — and many of them were dying to know the reason behind their breakup. But they’ve been able to watch the couples’ relationship unravel throughout Season 3 of the hit E! reality TV series — and in a sneak peek for the upcoming season finale, viewers will really learn what went wrong between John and Nikki, and it seems like Nikki was the one who was getting cold feet.

“It’s tough cause he’s fighting really hard for me and that makes it really tough,” Nikki told her sister Brie. Nikki started to get visibly emotional and she opened up to Brie and their mom Kathy Colace about the issues that are still persisting in her relationship with John.

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“There’s something that is making me not feel like I can walk down that aisle right now — and it doesn’t mean ever with him, I just can’t do it right now,” Nikki said as she choked back tears. “The tables have kind of turned. John is all in, will do anything to work on us. And that’s what started this, is when he asked to work on us and I said, for some reason right now I need to work on me. We naturally just give and sacrifice, and I’ve been doing it for a long time.”

Nikki explained that she felt that if she didn’t leave John again, she would continue to put her own personal feelings aside again. Nikki and John briefly split earlier in the season because Nikki wasn’t comfortable going forward with their wedding if John wouldn’t budge on his decision to have children in the future. But John did change his mind and said he was willing to reverse his vasectomy if it meant their wedding was back on.

“I didn’t give myself long enough the first time we called it off, and I should’ve given myself longer but I got so excited that he wanted kids, I couldn’t believe it,” she explained. “I never thought I’d hear that. But I realized it was just such [a] deeper problem. I don’t want to be the 66-year-old woman that starts living her happy life at 63. I don’t want to be that.”

Watch the full sneak peek below, and be sure to tune into the season finale of Total Bellas, airing Sunday, July 29 at 9 p.m. on E!