Quinn on "The Bold and the Beautiful"
Sheila (Kimberlin Brown, not pictured) continues questioning Quinn’s (Rena Sofer) loyalty to Eric (John McCook, not pictured) on the June 29, 2017 episode of “The Bold and the Beautiful.” CBS

She has never been accepted entirely by everyone when it comes to her role in Eric’s life, but Quinn may finally have met someone she may never hope to convince of her loyalty to her husband on the Thursday, June 29 episode of “The Bold and the Beautiful.”

Quinn (Rena Sofer) has had more than her fair share of doubters when it comes to the support she has with her marriage to Eric (John McCook). Though Katie (Heather Tom), Brooke (Katherine Kelly Lang) and Charlie (Dick Christie) all still continue questioning her on the CBS soap because of either their knowledge or suspicion that she still has something going on with Ridge (Thorsten Kaye), none of them have been overly vocal about their feelings. Everyone else who used to not believe in the couple has since changed their tune as well.

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However, one person who is starting to question things, and who isn’t afraid of vocalizing her concerns, is none other than Sheila (Kimberlin Brown), who is back in Los Angeles and, despite claiming she isn’t the same person she used to be so many years ago, is still hung up on Eric and wants him back for herself. After overhearing Charlie and Pam (Alley Mills), she has realized that there may be something about Quinn that isn’t right, and she is now making it her mission to try and find out what it is—even if it means continuing to try and pry info out of Charlie, who has no idea who she really is, or what danger she could pose.

“I’ve talked to some people who care about Eric, and it seems there’s some misgivings where Quinn is concerned,” she says in a preview clip.

After their initial talk, Sheila had gone to Eric to tell him she wouldn’t leave town until she knew he was okay, and he sent her away. She also had a confrontation with Quinn in the Forrester estate driveway, where Eric’s current wife told her she wasn’t to come over again without Quinn also being there, due to her known history.

Now, overall, she will continue to question Quinn, and planting some seeds of doubt amongst those close to the couple again, whenever she has a chance. And while the plan’s ability to work is a true longshot, it could start having an effect, ironically, on Quinn, who may work even harder than ever before to try and prove herself.

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Among the ways she may try to do that will be assuring Eric himself of her devotion to him, though he’s never questioned it. Still, she will insist on reminding her husband that she loves him deeply, and only wants to be by his side until her last day on earth.

“I don’t want you to ever doubt how much I love you, or my commitment to you,” she says. “You are the only man for me.”

And while Eric may appreciate her sentiments, the fact that she keeps sharing them with him could start to make him suspicious.

“The Bold And The Beautiful” airs weekdays at 1:30 p.m. EDT on CBS.