ExP and I separated a couple of years ago when I was pregnant. We have two other DC, now aged 10 and 5. For the first 6 months, he would come and see them at my house or we'd go out for the day - in my view to help him build to a relationship with them without me there. When I asked when he was planning on getting his own place and seeing them alone, he cut contact altogether. He didn't come to the baby's birth despite knowing I was in labour and alone with the other DC.
He has been in touch every 6 months or so since, asking if I fancy a day out with the DC...! I have reiterated that he's welcome to get in touch when he has a place to see them alone/plans to be a consistent presence in their life without me there. He then doesn't reply.
This morning I've had my six monthly message, but this time he's taken it a step further. He's now back in touch with his DC from a previous relationship that he cut contact with when our 5 yo was born, and has asked if we'd like to go and meet them both for a day out today!
How on earth can he think seeing my DC for the first time in so long would be a good idea alongside his other poor abandoned DC?! AIBU to stop my polite 'when you're ready to be consistent...' answer and just tell him to fuck off?
FWIW, I suspect the 6 monthly messages are only so that he can show his family/friends/the DC in future that he's trying to see them but that I'm not forthcoming and that this request to meet with his other DC is only to forewarn us where they're going so we don't bump into them as it'd be all kinds of awkward.