For those who don't know, we were friends although she's always been snippy. Overnight she turned on me. I've just realised why.
She began to get really nasty when DP and I began the process of buying a house together and got progressively nastier once we had purchased it and moved in.
She thought I was temporary. That's what went on. She assumed DP (who she very much thinks of as 'hers') was only with me on a temporary basis. As soon as I became 'permanent' she turned.
Could kick myself for not realising this sooner...
Aaarrghhh!
Anyway, as you were!