Classy and pristine to stay quiet? Sorry but i kinda not agree. Why is everyone seems like viewing the situation only from Tor's fans biased perspective? How this would effect Tor, how she shouldn't do this and that cause it would effect Tor. Just because she is a non celebrity girlfriend of a celebrity, she should stay prim and proper and perfect and bear with all the ugly messages she's receiving. Non celebrity or not, she is first and foremost, a human. A human who have feelings, who would feel hurt, who would feel threatened and who would feel jealous. I don't think she wants to be in the limelight, for me she's just hurt to the point that she was unable to contain, or in your word, to stay quiet and pristine anymore.
And comparison to the British actors to Thai actors is like comparing American singers to Kpop stars. Actors especially western/European, they date if they want to date, marry if they want to. they'd not be hiding their relationship at all. Thai actors, especially those dating non celebrities would not even want to reveal who they're dating like James Jirayu - to save his girl from all this mess.
Just sharing my 2 cents, some may not agree with me and that's fine. I don't agree with Tor's gf action, but i understand her.