How do you deal with a Narcissistic friend?

@ArishMell she can't change. In her mind she is perfect and usual just assumed everyone loves like they love themselves. There's no cure. Like rapist, Pedophiles there is no changing their personality. Thing is narcs have no remorse. Ever.

@ArishMell I have given the past 12 months of my life to a lady. It started off by driving for her, then odd jobs here and there. But my life went on hold as her needs took all my time and energy.
When it came to buying a place together, we at last found the ideal one. She could not sell her place and would not reduce the price despite not having one viewing in 5 months, while mine sold quickly. But when it came to clearing my house, things fell apart. Why was I away so long, How much more is there etc. My best furniture had to go, she would not have it in her garage. I could not take my greenhouse, my vehicles had to go, I could not keep store lambs or cattle on the 12 acres of land (I am a retired farmer). It was her house, her rules, no mugs or bowls allowed etc.
I gave into her on every thing.
On the other hand, she was making arrangements for a large swimming pool and having a touring caravan site on the land having already arranged 3 seasonal bookings.
On the evening before contracts were due to be exchanged on my house, she asked where my camper van was. I said it was gone, out of our lives, I had taken it to my sisters where it could stay until sold. That wasn't good enough, she angrily said I would then take it to the new house.
That was a lack of trust. I had given into her and given everything up.
I could take no more, this wasn't going to work. This wasn't a relationship, this was a dictatorship.
I walked away, cancelled the sale of my house and the purchase of the new place and the next day all my stuff was in a heap on the drive.
She said she was giving up everything, I would not give up anything, In truth, it was the other way around but she was never going to see that.
She said I loved my greenhouse more than her and the dogs, I was gay, I had a split personality, I don't have any friends, I didn't want to go to the new place, I wanted things to stay the same. There were so many reasons she gave for the break up, but never the same twice.
She was angry/upset/confused. But it would never be possible to have a reasoned conversation. Walking away was all I could do.
Having cleared my house, I then had to take everything back and resume my old life with a 900 pound solicitors bill for the cancelled sale. But at least I was able to go back to my old life.

@James57 Thank you for sharing such a personal story!
It's unbelievable how toxic and unreasonable she is.. I am glad you could manage to cancel sale of the house and get your old life back. I hope she is gone forever.
It's unbelievable how she tried to change the reality for you- a classic case of "gaslighting".

@James57 A dreadful experience, and I am glad you managed to break away from her.

It seems as if she really does not know what she wants from life - a life centred round her yes, but in what way? Does she know herself?

I hope the buyers you had to disappoint were understanding about it.

I am not a solicitor, but I'd have thought hers would be classed in law as the offence of "coercive and controlling behaviour".

@ArishMell thank you both for your comments.
It took my sister, a retired nurse, and her husband, a retired hospital doctor, to explain that she had narcissistic behaviour and to say I would either have heart attack or have a breakdown if I was to continue the relationship. They said it was domestic abuse.
She had slowly reeled me in to be her full time carer.
She ran everybody else down and so I am now told, myself too behind my back.
This was my first relationship and it hurt very much. I tried so hard to make things worth but I was giving everything

@James57 In the end she is her own worst enemy, but it may be a while before she realises it, if she ever does.