“I think you saw that in ‘You’re the One That I Want,’” he explained, referring to the romantic ballad Sandy and Danny performed at the end of Grease. “There’s almost resolve [of] that tension right there.”

Despite this, Newton-John said that they never dated because the timing was not right for them.

“We were both with other people when we were filming and I think, respectfully, it just didn’t happen,” she said, according to Radar Online.

Though they were never able to date, Newton-John believes their attraction to one another helped make their performances better.

“I think it was good because I think it kept the tension there and the chemistry,” she said. “It might have been a real disaster had we decided to date or we had a falling out or something. So I think it was just as well that it didn’t happen. But we’re still great friends.”

Earlier this year, Newton-John voiced her support for Travolta after his wife Kelly Preston died of breast cancer, a disease she is battling herself.

“She was a very a beautiful person, inside and out, and was beautiful to look at,” Newton-John told Entertainment Tonight of Preston, who was married to Travolta for nearly 29 years. “But she had a gentle spirit and I just feel so, so much for John and the children. It’s hard to put into words.”

Newton-John, who is battling breast cancer herself for the fourth time, added that Preston’s family has been “coping as well as you can imagine.”

“Loss is loss, and to lose your mother and your wife is an incredibly difficult thing, and it takes a long time,” she said. “But ultimately it’s a private journey and I respect that for them.”