They can be? I suppose the concern here is that an actor could act like they are interested in you even when they’re not. In reality, there are plenty of people that aren’t actors by trade that can be good at acting or faking emotions (part of the definition of psychopathy is the ability to do this). And there are plenty of bad actors that try to make a living out of it. Actor, as a profession, doesn’t tell you anything about whether the person wears their heart on their sleeve, is private, controlling, manipulative, loving, introspective, etc. People run a wide gamut, and their chosen profession usually doesn’t tell you much about them more an any stereotype about any other group of people.