Tasha's Dating IS a Route, meaning once you've made a choice to Date Tasha, it's the equivalent of making Dakota a Slut or your Girlfriend. You're locked in just like every other choice you ever make.
Yeah, I get that. But it's kinda non-obvious how it works in this particular case.
With everything else, it's a pretty straightforward choice whether you pick route A or route B. This is an instance where you start going down one route, you are greeted with an event that, on the face of it, looked like a "see content or don't" decision, and now you are locked out of the route you deliberately started.
For all I was aware, it was gonna be like going to Penny's place after work. But I'm the dummy that didn't put down any saves so the need to do a full restart was kinda on me I guess.