I don't think having a coffee/bath is a treat, but it is a statement that you need 5 minutes to yourself, and he needs to look after ds.
But again, you guys need to sit down and talk about it.
dh and I have this deal, it may help you as a starting point:
dh works x hours during the day at his job.
I work x hours during the day as SAHM.
Before either of us start our ''working day'' we are both at home and therefore in equal responsibility for the kids
After ''work'' when dh is home, we are both there and therefore have equal responsibility for the kids.
Over the years it has changed, but we will do things like take it in turns to do either bath/bed routine or cook dinner, so as baby is put down, then dinner is on the table (well, in an ideal world)
When one is in the shower in the morning, the other is getting baby dressed/giving kids breakfast.
Obviously, there are quite a few things I get done during the day, but when babies were very small, not much got done, and that might mean that at the weekend we were doing shopping/laundry together.
You are very upset and angry with him, and you need to try and find a way of expressing that in a constructive way, so that the two of you can find a way of being parents together.
It is pretty common I think to have these issues about now, it doesn't mean he is a bastard etc, it just means you have some serious readjusting to do.