Social Question

So enough about mold and toxins for a moment : I have a minor predicament.

There is a guy who I used to chat with at my local health store, who is now working at my gym. I really do enjoy talking to him, but the other night I made the mistake of giving him too much attention. I walked with him to his car, and offered to workout with him a few days later. I was smart enough NOT to give him my number, but now I'm afraid he's going to eventually ask for it!

As much as I wouldn't mind working out with him this one time, I have a feeling this might lead him to believe I want to keep in touch. I don't. I just enjoyed bsing with him from time to time at the health food store, but now he's gonna be at my gym every day!

I totally blame myself for possibly leading him on, and need to reverse the damage. He is a nice kid and is very prone to depression, so I can't just be a dick and ignore him.

I'm thinking I do owe him ONE workout, but that's it. If he does ask for my number, what should I say?