Taylor Swift and One Direction heartthrob Harry Styles are never, ever, ever getting back together ... because he wants absolutely nothing to do with her.

And the kicker? Sources close to Hazza say they were never even official!

Styles' decision was affirmed when Swift began to take shots at him onstage, in her video for '22' and in the press -- and even hiring out pals to do it for her.

“Harry might have taken Taylor’s swipes with an air of grace, but he now wishes he never ever dated her,” a source close to Styles told Radar Online. “I mean, the fact she’s aiming a jab at him in the '22' video has got Harry wondering what’s coming next! He just doesn't know what to expect."

The source also revealed something pretty shocking: for Styles, the relationship wasn't really a relationship or anything serious, but Swift, as she is wont to do, simply fell too hard and too fast.

“It wasn't the most amicable of splits, but Harry said all along that he wanted to take things slow and easy with Taylor," the source said. “There was certainly no commitment made, despite Taylor’s protestations and the fact that they were so busy with their careers and lived in different countries meant that it could never have really got that serious."

The source added that while Styles is pretty disgusted at what he sees as petty behavior, he's not the kind to retaliate.

“What for Harry was ‘a bit of fun’ at the time has slowly turned into a personal nightmare," the source said. "But he won’t stoop to Taylor’s level, he’s just going to continue to be the more grown-up person and get on with his life. Perhaps something Taylor should consider too."

Yowza. Tell us how you really feel! But we guess this all makes those deleted doumentary scenes rumors ring true.

Watch the Taylor Swift '22' Video