My husband and I separated in February and I moved out into a rental in April. Our son (9) is seemingly fine - we are 50:50 co-parenting and as far as he can see, being polite and respectful to one another, make each other a cup of tea when I go round to collect him etc. He does know that Daddy is sad though and that Mummy was the one who no longer wanted to live with Daddy.
So, the reason we split was that I re-met an old love and as soon as this happened it reinforced that our marriage was not what I wanted it to be. As soon as I knew this I told ex-DH, not prolonging, giving him - in Mumsnet speak - the chance to find someone who loves him etc.
This post isn't asking for judgement of my actions, which I know ended the marriage.
So, when can I introduce ex-new-love to our son? I haven't mentioned him at all to my son, wanting him to settle into new life arrangements first and not make it like I have replaced Daddy instantly. I was thinking maybe next April-ish, when it's been a year that I left. Starting with low-key meet up, ice cream. Then maybe have him come to dinner...before sleepovers.
My ex will put up a fight whenever it happens - understandably he hates my new-old-partner.