Sniff my hair

So I was lying there in bed, you know, afterwards. So, I'm lying there and he says to me how come your hair smells different?

What?

I don't know what the fuck that was. I don't know why he notices things like that. I mean what is that? How my hair smells? Is he gonna turn stalker on my now and and memorize all the products I use so that he can tell if I took a shower somewhere else? I mean what is that?

I told him his nose was broken. He kissed me and rolled over and went to sleep.

I'm just wondering what that's supposed to mean.