If I dream about anyone in my life, it's usually a nightmare and it's usually because that person has threatened my life in some way. I have had dreams/nightmares about my mental health people. Currently, very rarely. When ex-T left, a lot. My stressors with people come out in a lot of ways: them specifically, a replacement person of them, exactly how they hurt me, fear of future hurt, or even acts of violence (both from and to the person). And yes, I have shared my dreams with them.

I've always been told that it's the emotions of the dream that your brain is trying to process. Sometimes the content makes sense, sometimes not. But the emotions are what's important.