Can it be MLC? Sadly, yes. They can last for years, and some never come out of it. Your H sounds like mine, "but, when is it my turn to be happy?"
Suggestion: Create a spreadsheet which covers expenses for both of you, with both paying for equal apartments. You may want to include a little drawing for each which shows D at your place with you, and just him at his. Show him you cannot afford it.
Next, a new spreadsheet with you working and paying for childcare. Make it as visual and basic as you can. He's living in fantasy-land. You're going to literally have to prove to him why his beautiful dream won't work in the real world.
Next, ask for suggestions and help to solve the problem. Keep a straight face.
