Very sad to be here but H says he is leaving

[brokenheart71]

Well, I had a better week (Thanksgiving kinda threw me for a curve) better at detaching still need to work on GAL and 180s - more about those later but here is my big question for today...
Still struggling with my kids relationship with H. He called earlier in the week in a bad mood saying he needs to spend more time with them and implying that I am letting them make too many decisions and should do more to get them to spend the night with him (older D has only stayed with him once, younger D 4 or 5 time). I calmly reminded him of all the things I had done to encourage them to spend time with him but said I would not "make" them stay the night. He did call the next day and apologized saying he was tired/frustrated and took it out on me. Fast Forward to last night. He took them to a Christmas light show, and intended for them to stay with him. I helped them pack their bags but they both said they didn't want to stay with him. I told them they needed to go and they could talk to him about staying. I was invited out with friends but declined because I was really tired (haven't slept well this week) and have a busy day today. I was asleep by 10:00 - but at 10:45 I get a call from H that D12 wants to come home (they hadn't gotten to his place yet). I said fine. They get here and both girls come into the house - he basically just said goodnight to them. About half an hour later I get a text from him saying "sorry we woke you up, D was having a meltdown so I thought it was best just to bring her home. Then younger D changed her mind too. Again I'm sorry, but I really need you support when they are suppossed to stay with me. I'm not saying you haven't been, but they will always have an out and older D will take it. I need to spend time with them for both me and them."
I'm not sure how to respond. I really do not want to "make" them go. Or tell them they can't come home if they want to. I'm afraid they would eel abandoned again (now by both parents). I do know it is good for them to spend time with him, but don't think forcing it will be helpful. I will suggest again that he spend more time with them without the pressure of staying the night - they could be together all day and evening but they could come back here to sleep. They really aren't used to spending a lot of time alone with him, and I think the idea of going to his new place just really bothers both of them but especially older D.
I would love some advice on both helping the kids adjust and responding to H.