Also it was like one 19 year old in his entire dating history. I'd sooner call it a brief FWB during his Superman apex popularity that just got turned into "his girlfriend" by the press. Although he was also with Kaley Cuoco in a very obvious PR relationship (the paparazzi pics are almost as bad as Taylor Swift/Tom Hiddleston) so I wouldn't discount Tara as another fake relationship.
It just sort of stuck as very bad to his image along with his MeToo comment gaffe about "worrying about dating". So people sort of ran with it as "he's obsessed with teenage girls".
I think his team saw the way he looks and wanted to make him come off to the public as a suave womanizing playboy. The kind that probably do hook up with any hot young woman near them, even coed's like Tara. Which would help with the campaign for him to be the new Bond, which he's still considered in the running for. Thing is he's clearly really awkward and bad at it. There's like a compilation of interviews where people point out his good looks and he seems like he's in pain whenever anyone speaks.
Consequence of growing up fat and nerdy, by the time you're finally hot you don't know what to do with it. It's probably saying something he looks happier either drinking with gay guys or playing Warcraft than he does being a "hunky womanizer".
Also I know we shouldn't judge based off "gay voice" but idk. It's a little