He sounds like a right sad sack who neither loves or respects you and should therefore be given his marching orders. He is trying to cheat under your very nose, where is your line in the sand here?. Do not stay with such a man merely for the sake of your daughters here either, they won't say thanks mum to you for doing that to them.
This too is a very disheartening comment:-
"He's constantly got his vape thing in one hand and his phone in other. All weekend he just the same. Watching whatever crap on tv while me and girls are doing whatever needs done"
Both they and you sound like maids to this man. Who died and made him king exactly?.
When your DDs do move out as well I would imagine that neither of them would want to come back home to see either of you all that often. They could well wonder of you why you put him before them. I sincerely hope that neither go onto partner up with such lazy assed and entitled men but they could well do so, they have learnt from you too. I doubt very much that either will move out anytime soon, particularly your youngest.
Why would you at all want to stay with such a man after they've moved out anyway?. Where's your self worth at along with your boundaries here?. Are you afraid of him or otherwise afraid of being on your own?.
What do you get out of this relationship now?. You have written yourself you want out; well act on this thought some more and seek legal advice re getting him out of your day to day life.
What do you want to teach them about relationships and what are they learning here?. You're still showing them that currently at least, all this is still acceptable to you on some level.