My 5yo said yesterday that ‘Missy’, daddy’s gf, has told her she’s her stepmother. They’ve been together a bit over a year and have lived together most of that, she’s his 2nd girlfriend since our split in mid-2020 although first was probably just a fling. Split is still acrimonious, ex would prefer me not to exist regardless of being their mother. I know I don’t need to be informed about stuff but I get nothing. When he moved in with this gf a few months after we split I was informed by the kids, he also wouldn’t give me his address for 6 months and they stay with him EOW! The kids were told the gf’s mother is ‘Grandma’ literally since ex moved in with the gf. These are just a couple of examples of many things I consider to be … I don’t even know what to say here… weird? out of order?… but mainly confusing for the kids? They’re only 5 and 3. I’m sure people are going to say get over it because at some point it’s going to happen anyway and I can’t raise it with him because I’ll just get abuse back. AIBU to be a bit shocked and think it’s weird and unnecessary for the gf to have instigated this?