Adrian responded with a smile, appearing somewhat interested but not giving Leighton a definitive feeling, handling it very appropriately so as not to stimulate Leighton nor give others a handle, while also winning some time to investigate whether there was someone behind it—though the likelihood was low, that level of observational skill he still possessed.
In Hollywood, such a place of glamour and excess, heartless situations are all too common. Before going to bed, there's endless sweet talk, and after, it's an immediate shift to a "I don't know you" expression. From Marlon Brando to Jack Nicholson, from Clint Eastwood to Woody Allen, they've all had such experiences, and even Warren Beatty, praised by many women, did the same. He was gentle towards the famous actresses, but what about those who were not well-known?