Not that I am agreeing with the poster, but I have heard many times that they started dating right after the KC game.
Where have you gotten your information about him dating her before the season? Sincere question.
Yeah, I'm not buying the girlfriend explanation either. He wasn't some nerdy dork who'd never been laid before, he was an NFL QB and before that was a college QB at a prominent school that probably had a significant amount of female "talent" on campus that was available to him. His current hot gf is thus probably not the beginning of his carnal experiences, as I feel fairly confident in saying that as a highly rated QB at Cal-Berkely (enough to go #1 in the draft) he was no stranger to spending intimate time with hot women.
I think his decline with the Rams is nothing more complicated than the team declining around him, not being able to make up the deficit, and having his confidence and play decline in a vicious circle. He began 2018 with a stout OL, three great WRs, and peak Todd Gurley. The next year he began the season with a shell of Gurley, a declining Brandin Cooks (thus, the decline of a deep threat) and an interior OL that included the bad Brian Allen (not yet ready), a badly miscast Joe Noteboom (who should never play guard), and turnstile Austin Blythe at G. And then injuries and shuffling further messed up the OL. Brandin Cooks got his bell rung a number of times and our deep game went into the toilet. Goff couldn't compensate for all that, and thus his play declined too, and along with it, his confidence. While it looked like things might get better early last season, once teams figured out that we had no deep game and that we had a turnstile at C who could easily be bull-rushed by just about any NFL D-linemen (and who is missed by precisely
nobody, irrespective of what side they were on in the great Goff debate), his play reverted and his confidence continued its tailspin. Even then, he still had some decent games, but just not enough. So the team moved on and got someone better.
It's fair to criticize the product he put on the field and just as fair to say that Stafford is an upgrade. But the whole "he got laid and didn't care anymore" as well as the "he got paid and didn't care anymore" is just a bullshit attack on the guy's character. Everybody around Goff has vouched for his character, and if he didn't care I doubt Brad Holmes would have pulled the trigger on trading for him and taking on his cap hit.