My BF keeps questioning me about drinking his wine when he's out. I don't touch it aside from when we occasionally have a glass together in evenings but he insists he can smell it. M&F both 30, together 3yrs.

This might just be a casual thing I'm not sure. My BF bought a barrel of ?30 wine off his mate, it's got one of those self-pour things. I'm not into wine but I'll have the odd drink on nights we are together. I gave him ?10 towards it for that reason. I never drink during the day and rarely drink at all.
We get different days off work, and sometimes he goes fishing in evenings and comes back late. I've told him loads of times I don't drink alone, but for the past two weeks he's came home, gone into the kitchen where the barell is and casually says things like:
1) I can smell wine, have you had any?
2) Did you have any wine today?
3) (One day I was tired and nodding off on the sofa) Are you drunk??
4) The wines nice have you had any recently?
5) Are you sure because I can smell it??
Like it's seeming more like an interrogation by the day lol. I always say "No I wouldn't drink it without you here, especially not in the day" but he insists that he can smell it, I can't smell it at all but his sense of smell could be stronger than mine, or it could be in his head - either way I'm not drinking his stupid wine.
Any thoughts on this? Is it just a stupid thing he's doing to make conversation? It's starting to bug me as I feel interrogated and like he doesn't believe me that I'm not drinking his wine.
Edit: He isn't smelling my breath or anything, he will come home, go to the kitchen where the barrel is, and says it smells as though it's recently been poured. I'm in a completely different room at the other side of the house.
TL:DR BF's questioning me about drinking his wine when he's not there, insisting he can smell it. I'm really not drinking any of his wine and keep repeatedly telling him this. I haven't touched it aside from the odd night when we are together I'll have one glass.


Source.