advice please

[CW2017]

Hi all
on the subject of whether I am indeed now Plan B, this may well have been building up over the years (I always thought she was less than enthusiastic about anything connected with my 50th birthday at the time a few years back but that could be just be a personality trait of hers, i.e. I was getting too much attention from other people, who knows....). My query is basically if my status with her has changed more recently, would there necessarily be a change in her behaviour towards me? She has an absolutely fantastic poker face (which helps when you a pathological liar). More specifically as there is no potential in her workplace setup (and reduced working hours contract) for taking it to the physical stage (although I will be monitoring the situation closely) would any frustration with that also manifest itself? thank you again