Where there is one, there is always the other
It takes real courage to turn the light back in on yourself, and get clear about what it is you need to do in your relationship, especially when it gets to the point of using terms like narcissist. So here is the difficult bit to swallow with 'where there is one, there is always the other.'
If your partner calls you a narcissist, then sure as nuts, there are also times when they are also narcissistic or vice versa. I know, it sucks to realise that it is also possible that you yourself may have a part to play in the creation of your partner's behaviour. These are the blindspots, and because our pain prevents us from seeing reality in a 360 degree view, it does take a professional counsellor to help you navigate this in terms of what is real and what is not. Its not always something you can see yourself or call you or your partner out on either. If you do see it, then how to remedy it is where I come in. I show you how to navigate this area with communication, challenging our thoughts and looking at the family system to see what is the story that needs to be told.
All said and done, its can be a joy to keep exploring your relationship for the gifts it brings, the good and the bad. If it brings you to a exploratory journey around the power of labels, and how they should be used or not used, then we could agree that your partner is your best teacher.