Yes, that is detaching, making dinner for you and D and if he's in great, if not, you were going to eat anyways.
I would stop the contact all together. This is sort of insulting, what he's doing to you. It took me a long time to realize that and really I'm still very insulted about all of it but I do want to see if this can be worked out.
Now H and I are dating again. Very strange, but that's where we are. I will call or text him or email him once or twice a day. Normally, the email is logistical, dealing with bills. The texts and calls could be What's up? Or logistical. But that's where we are now, H and I. Before that, it was difficult but I tried to keep it tactical. H was actually the one to break down that wall and make it more social if you will.
If you've never done the what's up, then yes, it will seem like pursuing now.