I know I am being childish but it gives me some tiny satisfaction. So the question is shall I stop or ramp it up?
H left last august. He swore blind there was no one else. I even named someone and asked if he was seeing her. Hey presto, a month later she is round all the time having dinner, watching tv, hanging out with my children. Then I accidentally discover they have booked a long haul holiday together whilst I am away for a month with the kids taking them overseas to visit their grandmother. He continues to deny anything is going on. They are just friends and she is supporting him in his terrible trauma of being married to me for 15 years and being in a relationship with me for 25 years. Then I find an old letter down the back of a drawer from her to him. Whilst it isn't definitive, it is not appropriate between colleagues in my view and refers to exciting changes in the coming year - the only change in his life that I know of was moving out. He still denies it all and says that I always think the worst of him and this is a reflection of my negativity and one of the reasons why he left (actually I was pretty cheery before all this, albeit cynical at times). Now his lady friend is a former friend and she has said some stuff to me that is totally out of order, memorably that we never had a real marriage.
Here come the childish bit. I refer to her to him as Slutty McSlutface or the Russian whore. And if I ever drive past her on the street I slow down a bit and give her the finger. I know it's not graceful but I want to cause her discomfort (I already cause him as much inconvenience as I can) and otherwise she waltzes around scotfree.