Just a side note about him "making it"
It's not music he loves it's fame, or the idea of.
I have friends and relatives who love music. They write and play in their free time. And then they work where they can within the industry.
As a sound tech, or a music teacher, a voice coach, one plays in a bar. They tutor in their given skill, if they need too.write music for t.v,games adverts.
They live and breath their music.not everyone in music can be famous.
He just wants to be discovered and that isn't gonna happen sitting in your Apartment.

You have matured in what you desire in a relationship, he has not.
Perhaps if you spelt it out, calmly,not during an argument he would get it.
Do remember though he gets away with this behaviour only for as long as you allow it.