He’s actually being very straight forward. It’s just not what you were hoping for. 😕 His behavior indicates that he wants a professional relationship at work, and a sexual relationship without dating, outside of work. You’re confused because you’re thinking there must be some middle ground — like dating, getting to know each other, flirting at work — but there isn’t for him. Nope! He wants sex outside of work, without a traditional, romantic relationship. And that’s it.
As for what you should do, it’s up to you. If you want a sexy fling, he’s ready and willing. If you’re looking for a romantic, dating relationship that’s traditional, he’s not your guy. When you try to get him to open up, and he shuts down, it’s because he doesn’t want to open up. That’s his way of letting you know, he’s not into romance and dating. I wish I could tell you more, but this one is pretty simple. What you see is what you get.
Hope that helps!