Is this guy interested in me?

So, there is this guy that is my gym instructor. I noticed that sometimes I catch he looking at me and stuff. Today, he came up and said: What would you do if your boyfriend give you a box with passionfruits as a present? (For those who doesn't know, this fruit has a tranquilizer effect)
And then I said that I didn't know what I would do, and he explain that I didn't understand because I doesn't have a boyfriend. And said that thing about the fruit.
For me, he tried to make a joke, or something. Maybe he has some interest in me?

I don't know if he's interested in you, but the conversation was truly bizarre. I'd stay away from him.