I'll try and answer most of the above posts with this, before I go off to put my head down for the night.
Firstly, as others have said, she's probably reading this topic, at least I'm going to assume that. Therefore, I'm not going to be so foolish as to post on here what I am or am not going to do or when. I see no reason to allow her to prepare for actions I will take.
I posted the warning as it did occur to me that this might be her about to quit and, wanted to warn others in case she tried it with them.
She certainly didn't look guilty when I saw them in the street later. If there had been a police car passing I probably would have flagged it down.
Being honest, I thought I was lucky with my experiences with Sasha, as I don't seem to have had the same treatment as others and, would have classed her as on of the best in Edinburgh. I would not have believed this of her previously. I don't think she should get away with it by any means.
There have been a lot of helpful suggestions on this thread and will be thought over well.
I am presently single so, have very little to lose by following some of the suggestions.
Bit of a shitty thing to do is NOT how I would describe it. I've run out of words that suit my feelings just now.
Obviously, she saw me as an easy touch and happily sat through dinner lying all the time. She seems very accomplished at that, now that I have suffered from it.
It will be interesting if she tries to get in touch with me, not that I expect that, without some form of encouragement. She's welcome to get in touch and try to sort things out but, I wont hold my breath.
She thinks she has me pegged - she might be right, she might be wrong - I've surprised people before now with my reaction to being mistreated.
Flakey with Sasha, is to me, her bad comms at times and standing people up. I saw no sign of drug use or mental illness, not that I would be anything of an expert on either. I think she/they just saw a chance and took it. I am bloody mad about it but, it could have been a lot worse. I would not have liked to have been in the same room as her pimp/boyfriend, possibly with a knife. She did say during dinner, that she no longer had a boyfriend so, she either lied about that or has picked up a new one.
Thank you to everyone who has offered suggestions, info etc. I will post any new info when I have it. In the meantime I can only say that an experience with Sasha is likely to cost dearly, in ways you don't expect. To some of the comments above, being blunt, screwing or fucking were things that certainly didn't happen last night, well not in the way I expected

Oh, at least I enjoyed the meal, saved me cooking for myself.