Dreams are largely symbolic. If it were me having that dream, I would think either it stood for my own self-hatred, or it could indicate any beliefs and doubts I had about my girlfriend.

If you only heard voices one time, it's probably from extra and extreme stress you're currently through and nothing you should worry about unless it happens again, but in my opinion that's unlikely. Plus, if you were half-asleep or just waking up, could have just been a "fluke."

It sounds like you already communicate with him, so that's good. Trust is essential, and don't rule out how much a person's own self-hatred can make it seem like others hate you. It's a very real feeling to feel hated by other people when most of the hate is coming from one's own self.