Hi Sam,
I can only echo what Thistim has said. Protect yourself, your life, and your sanity, and leave while you can. He hasn’t taken any steps to change, clearly doesn’t want to change despite you making it clear it’s a problem, and it’s obviously escalating if he’s using through the week and not just when out with his pals. The stories you’ll read here are all fairly similar and I think many of us wish we were only 7 months into a relationship and could do a runner without our lives being ruined!
I’m years and years in now and my partner started relapsing last year, for a full year, and now I’m stuck in a house we bought having had to kick him out after a year of empty promises and lies. He’s now getting better but that’s up to him and I know now that I can’t fix him, I would just go insane trying. If he wants to get better, he should go to CA meetings, preferably everyday. But you go focus on you, as this will bring you nothing but heartache and you don’t deserve that.
Take care of yourself and don’t take on something that will only harm you x