It's been a decade since Tom Cruise and Penelope Cruz ended their three-year relationship. Though both have obviously moved on from each other (Cruz is happily married with actor Javier Bardem while Cruise wed and divorced Katie Holmes), reports are still surfacing about the cause of their break-up.

In a recent report published on Tony Ortega's blog "The Underground Bunker" it was revealed that allegedly, Scientology leader David Miscavige didn't approve of Cruise's relationship with the Spanish actress at the time. This was according to Tom DeVocht, one of Miscavige's most trusted lieutenants in the Church of Scientology and a former Sea Org executive.

DeVocht will be featured in the upcoming HBO documentary by Alex Gibney titled "Going Clear: Scientology and the Prison of Belief," which will air on Sunday, March 29 at 8 PM, according to the blog.

Through The Underground Bunker, DeVocht gave a few insights on what the viewers will see in the documentary. He related an incident when Miscavige allegedly said Cruz "had looked at him funny" at the premiere of "Vanilla Sky," a film wherein both Cruz and Crusie co-starred. It was also during that time when Miscavige allegedly said Cruz was "too Catholic" to be with the "Mission: Impossible" star.

Cruise's romantic involvement with Cruz came after he ended his 10-year marriage with Nicole Kidman, Perez Hilton recalled. According to the gossip site, the 52-year-old actor wanted to marry Cruz back then, but she began to feel that Scientology "was the third wheel of their relationship," which then resulted to a separation.

"Tom was head over heels in love with Penelope and could see them spending the rest of their lives together, and she felt the same way. However, Penelope pulled the plug on the relationship because she felt that the Church of Scientology was the third wheel in their relationship," a source of Perez Hilton revealed.

The 40-year-old actress, however, didn't hold grudges over Cruise's religion, and Perez Hilton claimed that she even "admired" the actor's dedication over it.

"Penelope doesn't have anything against the Church, but it just wasn't her thing. She admired Tom's dedication to it, but it wasn't her cup of tea and wasn't something she wanted to give her life up for," the Perez Hilton's insider further shared.

In 20014, PEOPLE reported that Cruz took Scientology church courses and she found them beneficial, but she remained a non-member of the L. Ron Hubbard-founded organization throughout her relationship with Cruise.

Just last month, Cruise and Cruz reunited together with the latter's good friend and fellow actress Salma Hayek in London, England. According to a report from E! News, the former couple ran into each other at the sophisticated Mayfair restaurant Scotts.