I saw this on tv somewhere between 2006 and 2011. In color, English speaking actors.

A man lives multiple lives all at the same time. One of which he is an actor. I specifically remember a scene where he is in a car, having a conversation with someone, and believes that to be his reality. Then, in another reality he is an actor doing a voice over or dub of that exact same scene. I think I remember there being an explosion at some point.

At the end of the movie a woman explains to him that he isn’t human, he is more or less a god that created that reality and got stuck in it. And that the only way out was to accept his fate to return to his astral form. At the end of the movie he becomes a flash of light.

I wish I could remember more details.