I think give it a bit more time hun. YOu've been given some great advice and like the others have said I would try to encourage him to spend more alone time with her (taking a shower or bath together or suggesting he take her for a walk etc). Maybe use the reason of 'I'd like to spend some time with I and E so could you please take A for half an hour or so?'. Best of luck, I hope it all improves soon.