>>903 Agreed that this is the most likely. He won't want HR to be all about the relationship. As for ISTL I also doubt they will present as a couple. Body language will be interesting. He is very touchy feely with co-stars he adores (Tilda, Jessica). I expect he will be unusually remote, for one of three totally indistinguishable reasons: never were a couple and doesn't want to further the wrong idea, have broken up /decided not to take it further after PurseGate, are still a couple but want to keep it under wraps.
PS After recent sightings I personally suspect a variant of 2. If I was male, rolling in money with a cute new gf and an empty schedule, I'd be where she was. The more so if I was about to have to work on a big project for months.