Advice needed please. My ex is a serial adulterer, a narcissistic dangerous man where women are concerned. I left him when my boy was 3 & divorces him shortly after whilst my mum was dying of cancer. I discovered he was having an affair with “our” friend who was also his PA. I have gone on to remarry & have another child, I’m perfectly happy & my son sees his dad for 3 sleepovers a week.... it’s been hard but we have made it work for my sons wellbeing. Now my son is 12, his dad is now talking about moving in with the women, after 8/9 years of an on off relationship..... she is STILL in the process of finalising her divorce (she separated from her husband a year before I divorced mine!) my son has discovered that his Dad is cheating on this women he plans to move in with..... he’s read emails & texts from this other women..... I’m at my wits end with anxiety, this is a potentially destructive situation.... moving in with her whilst he’s cheating on her, into her very expensive big house which he’s going on the mortgage with, her children trust him, my sons put in a horrible situation. I do admit that there is a small part of me that wants to tell her to blow it all out of the water, protect my son & her family from this mess! What should I do??