And behind coworkers' backs at all manner of places of employment.
Who hasn't secretly (or not so secretly) tried to nudge a close friend towards someone? It's practically a rite of passage, especially among teenage girls, to meddle in your best friend's love life.
In Doctor Who fandom, the concept of romance between the Doctor and any of his companions is extremely controversial in some circles. That has not stopped a number of actors from publicly stating that romance exists between their characters, in interviews (printed and televised) and at fan conventions. Examples have included David Tennant referring to his Tenth Doctor and Rose Tyler; Alex Kingston in discussing the Doctor's wife, River Song; as well Matt Smith, Peter Capaldi and Jenna Coleman all at one point or another going on the record regarding the romance between the Eleventh and Twelfth Doctors and Clara Oswald. All these statements, plus related statements by showrunners Russell T Davies and Steven Moffat, are treated as Word of God by some fans and apocryphal by others, regardless of any on-screen evidence that may exist in support.