Can a man ejaculate if he is sad, depressed, or emotionally hurt?

Yes, it's possible: Each person is different. But there's no physical impact of negative feeling states on ejaculation in the moment. Over time, chronic major depression possibly could affect a man's hormonal system in ways that might do this. That said, there is no reason to doubt that a psychological effect of those feelings could lead to experiences of impotency. Talk to a psychotherapist about it early. Best 2U!