Taurus & Capricorn guy Dilemma!!

I have a capricorn guy at work who I kind of had a crush on for a few months now. It started with him flirting with me and he still does from time to time. I couldn't let it go on without finding out his name and eventually I finally got the guts to ask him and he told me. Fast forward to a couple days ago my friend called herself trying to hook us up. She told him I know someone who is interested in you and then provided my name. His immediate response was who is that? Then after describing me he concluded "o I didn't know that was her name" but ask her for her number for me. When she told what had occurred I started to write down my number but than hesitated because how can a guy who flirts with me, had minor convos with me, and I even asked him his name not know mines even though I wear a name tag! Should I still give him my number or totally write him off? Because I'm seriously interested in him and I'm not going to be a fly-by-night girl just to pass his time.