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He is most likely staying a lot Over night under your roof and may Consider it His as well, I can tell.
Little by little, perhaps for his own Convenience, he is 'Leaving thing at my apartment' because he can grab it when he needs it, and it is like his own Home away From.. Home.
When he begins to leave his toothbrush, along with the Bluetooth, then it is time to have a talk with your honey, and ask him if he is planning on paying some Money... To live with you?
Of course, you can always a say "No," if you find he is moving too Fast for two people Who... Are Dating maybe not Mating.
Good luck. xx