He keeps joking about people thinking we’re having an affair?

I have a close guy friend- known him for 2 years. I must admit at the beginning when we first met, I crushed on him so badly. We would stop and have long chats in the corridor at work. He would always come and find me and ask how I am etc. I later discovered he had a girlfriend, through one of his friends. My feelings remained the same but obviously I would never act on anything with him being in a relationship. Fast forward 2 years and we’re now really good friends. We text often, he finds me at work, we meet for lunch etc. we meet outside of work as well.
I have no idea how he feels or if the attraction was ever reciprocated. He jokes about people thinking we’re having an affair and will say things like ‘we can’t be seen together here’ or ‘we can’t meet for lunch again’ and we both laugh about it.
But I’m wondering if there might be something there from his side? Or am I just crazy and making this whole thing up.
I really want to bite the bullet and ask him but with the girlfriend it’s really hard, I’m respectful of that so would never cross any boundaries you know. TIA

He keeps joking about people thinking we’re having an affair?
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