I feel like I'm losing my partner to video games?

My partner and I have been together for 5 years, we've been engaged for 2. We live together too at my dad's house (whilst we carry on saving for our own) He's going to University so isn't employed so I'm the only one working/making money for us so I'm paying all of our bills and rent. I work full time as a secondary teacher and come home to a messy house, and have to do all the housework (dishwasher, laundry, hoovering, cooking - all of it) he's currently waiting for his uni course to start. Im getting annoyed because he's spending from 4pm to 6am gaming and then is asleep the rest of the time. We don't even sleep at the same time anymore because his sleep schedule is messed up. I feel like his mother and that this isn't equal at all. I need some advice, i don't know what to do? I've spoken to him about my feelings and he just says he can't help when he's tired and because he has no responsibility yet, doesn't seem to care.

Updates
8 mo
We've also not been intimate in 6 weeks because we aren't in bed at the same time.
Updates
8 mo
My question is, what should I do? What would you do?
I feel like I'm losing my partner to video games?
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