My response is "well, something has to give because I can't carry on like this" he says ok fine we'll speak about it at the weekend. Weekend comes, I'm tired from work, conversation doesn't happen, then before I know it it's time to pay the bills again
OP you are an intelligent person. You can see that by saying "I can't carry on like this", your DP just has to fold his arms and go, OK, right, aaaaand.... leaving you with the problem of what happens now that you've declared you can't go on like this.
Hes mugging you off, he is telling you who he is, someone who isn't willing to do anything more than the very bare minimum to keep you from kicking his sorry arse out, putting the house in the market, splitting the proceeds and walking away. <<<< This is of course figuratively speaking but you get my drift.
Trouble is, he knows you won't take any drastic action, so he's sitting pretty, happy to flop along aimlessly, being a passenger.
whether you want to accept that reality or not, it's there and your choice whether to let things continue.