Split up with partner 5 months ago. He has been dating someone for 9 weeks (2nd person since we split so know it hasn’t been longer) and moved in with her last week as told me he couldn’t afford to private rent and she had offered for him to move in. Bit of background she was in a DV relationship 5 years ago and on one night when an awful attack carried out the police automatically removed her 2 children in 2020. They have lived with her mum since and she has just split from her ex in December 2024 she said she was unable to leave him any earlier and 5 years ago signed her children over to her mum. My ex wants my children to sleep over at her flat from next week (the same flat her ex carried out the DV) I have told him my concerns 1. I do thinks it’s soon as we did agree 6 months when we split to introduce new partners however I understand it is his choice 2. I am not happy about my children staying in that flat incase her ex for some reason turned up. Plus ex partner hasn’t even met her children but he’s moved into what was once their flat. So I would also feel heartly sorry for her dc if my dc were staying over and they can’t as she has to apply to get them back. The whole situation seems bizarre to me as I wouldnt dream of moving someone in who hasn’t met my children and I really don’t feel at this moment in time it is safe for my children to stay there but ex partner said it’s his nights to have children and they sleep where he sleeps so I’m stuck. All info came from both of them. Any advice please as never been in a situation like this and they are making out I’m jealous for raising my concerns? Sorry for long post