On the Married at First Sight: Where Are They Now? special for Season 13 that aired in November 2021, Bao and Zack were shown going on a date and ultimately deciding to embark on a serious, exclusive relationship about four months after "Decision Day."
(Decision Day had featured Bao choosing to divorce Johnny Lam while Zack also asked for a divorce from his MAFS match, Michaela Clark.)
"I never thought that was a real thing," Johnny admitted.
Kevin asked, "You don't think it was the real thing?"
"No," Johnny repeated, prompting Kevin to ask, "You don't think there was a natural attraction? Because they proclaim that they had a relationship."
"I feel like they proclaim a lot of things," Johnny snapped.
Johnny went on to insist, "But he was never serious about any of them. [Zack] wasn't committed to Bao and he wasn't even committed to Michaela."
"He was just going around, sleeping with half of Houston," Johnny declared.
In late 2021, a woman named Elena Guevara, a then 21-year-old cosmetology school student who had moved from Ohio to Houston in Fall 2021, accused Zack of repeatedly cheating on Bao with her and multiple other women.
Elena insisted last year that Zack had been dating and having a sexual relationship with her while he was also involved with Bao.
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Elena claimed she had no idea about Zack's romance with Bao at the time and so once she found out about Zack being an alleged two-timer, she reached out to Bao and informed the MAFS alum of her then-boyfriend's betrayal.
In early December, Elena posted alleged "receipts" of some of her text messages with Zack on Reddit in attempt to prove Zack had spent a month-long period from late October to late November cheating on Bao with her.
And then Elena conducted a YouTube interview on India and Michelle's channel, when she recalled how a friend and big MAFS fan had pushed her to get in touch with Zack once she became a Houston resident.
Elena said she sent Zack -- whose Instagram was private at the time, while Married at First Sight 13 was airing -- a follow request as well as a DM, to which Zack allegedly replied with his phone number. The pair allegedly hung out the same day they first chatted.
However, rumors that Zack and Bao were involved in a post-show romance had also already begun circulating online in September, when the pair had been spotted enjoying a romantic dinner together followed by subsequent museum and club dates.
But as someone who wasn't a Married at First Sight fan, Elena claimed, "I had no idea about [spoilers Bao and Zack were together], and he had told me that we weren't able to go on dates in public because we'd be photographed together and posted on a blog."
"He told me that if he was photographed with another woman, then the show would sue him because everyone had to be under the impression that he and Michaela were still married because people couldn't know about the divorce and he couldn't file for divorce yet until after 'Decision Day,'" she explained.
According to Elena, she remained in the dark about Zack's relationship with Bao until the end of November, when Bao posted a gallery of Instagram photos that appeared to show Zack and Bao spending Thanksgiving together with Bao's family.
Elena apparently posted a public comment on Bao's Instagram posting that said, "I wonder if she knows that he's been sleeping around with other women in Houston" in an alleged attempt to let Bao know what was going on.
Elena said she tried to confront Zack about his relationship with Bao on November 28 and he denied it, which led her to sending Bao a direct message on Instagram that same day.
Bao allegedly replied to Elena's DM on November 29 and things "blew up" from there. Bao allegedly asked Elena for evidence, which Elena said she was able to provide in surplus.
"We had like a 20 minute [Instagram audio] call and I told her everything, and she was honestly in disbelief and clearly very hurt," Elena claimed.
Elena said once Zack was caught, he "played the pity card" and allegedly tried to get both Elena and Bao to feel sorry for him.
Elena, however, told India and Michelle that Zack bounced back very quickly and asked her not to post any of their messages on social media. Bao then noticeably stopped following Zack on Instagram.
During the month they were dating, Elena said Zack had told her he wasn't talking to or dating another girl. To make matters worse, Zack allegedly told Elena that he hadn't even dated anyone after deciding to divorce Michaela.
"I assumed I was the only one he was talking to. He told me that he wanted to be serious with me, and he told me that I was perfect and I was his dream girl and I had everything he's ever looked for in a girl," Elena said.
"And so, he was the only guy I was with, and so I assumed he was doing the same."
But even after speaking with Bao and ending things with Zack, Elena apparently still remained upset about the backlash she was facing on Instagram for her prior public comment on Bao's Thanksgiving post, so she decided to join Reddit's popular Married at First Sight subreddit to "save her image" by sharing a collection of screenshots showing her text messages with Zack, as well as their initial Instagram connection.
"People were coming at me basically saying that I was some crazy fan girl, and I was like, 'Listen, I am going to save my image because I did not do anything wrong,'" Elena explained about the series of Reddit postings she made earlier this week.
The screenshots of Elena's alleged text messages with Zack on Reddit were intimate and at times sexually explicit, and a couple of the uploads have since been deleted.
In one of the screenshots, Elena alleged that Zack occasionally spent time with Bao and herself back-to-back on the same days.
Zack's alleged "I'm not [dating anyone]" text-message exchange was also one of Elena's screenshots.
"I really just wanted everyone to see his honest, true colors. This is the kind of person he is. He manipulates women," Elena noted, adding that she believes Zack had used Michaela.
"This is a repetitive thing for him. He is constantly using women for sex, and it comes to my attention that I was not the only other woman."
Elena claimed she also heard from "other women" claiming they had also been "involved" with Zack besides herself while he dating Bao.
"He told me that his type is Hispanic women... The other women have come forward to me but asked to remain anonymous. They are also Hispanic," Elena said on the YouTube channel.
"He always told me about Michaela. He said, 'I was never attracted to Michaela, from the second we got married' -- and this and that. He said, 'She's not my type.'"
After her own experiences with Zack, Elena came to the conclusion that Zack was the only person to blame and he must have triggered and been at fault, at least to some degree, for Michaela's outbursts and knee-jerk reactions on Married at First Sight's thirteenth season, for which Michaela was heavily criticized.
Elena concluded that she had "undeniable evidence and receipts to back up every claim" she made and she only posted a few of them on Reddit to spare herself some of the more personal details.
"I think [Zack]'s silence is speaking volumes for him," Elena said, wrapping up the interview.