I have often seen unanimous advice on MN stipulating that a parent should wait a good length of time before introducing their DC to a new romantic interest/partner.
Does any evidence/research exist that can be used to support this advice?
I am getting rather desperate as Ex will not accept that moving in with a new GF/partner (who DC has never met) would be sufficient and acceptable to then demand overnights and weekend contact. Currently Ex has supervised (by me or grandparents) visits at my home, a park or similar, as Ex hasn’t capacity to keep DC safe or functionally parent a child. DC (5) has diagnosed separation anxiety, anxiety, and is currently being assessed for ASD.
Thanks (in advance) for any information!