Hi there -- I agree with nothing risked, nothing gained. I would not give my home number, because I am super-cautious. I have given my work number, and one time I was very glad that I did, because the guy I met casually on the street while walking my dog turned out to be a jerk. There were plenty of male coworkers around to offer support.

I would suggest meeting for coffee at a public location, preferably in daylight, such as on Saturday. If he isn't available on a Saturday or Sunday afternoon, could be a sign that he already has a gf.

His talking to you may be a sign of interest, but it could also be a sign that he's a friendly guy, or even that he's a flirt looking for another notch on his bedpost.

Good luck with this. It's well worth exploring. BTW, there's a good book about facing our terrors -- Feel the Fear and Do It Anyway.