If you love someone so much you have dreams about them dieing or getting hurt because you care about them or worry about them. It just means that you love her with all your heart.
I Dreamy My Current Girlfriend Died In My Dream Last Night. What Does That Mean?
It could mean several things. You might be insecure in your relationship and have a mild to moderate co-dependency issue. Or it could mean nothing at all. Dreams should not be taken seriously from a medical standpoint.