Does me like me

I have a crush on my new colleague, we briefly spoke when we first met and ever since then he’s gone out of his way to find out my name and always flirts with me and stares at me when he sees me, sometimes we’re alone together and we play fight and his even put his arm around me. I can’t help but smile when I see him, everyone fancies him but he puts so much attention on me even after a busy day he talks to me.

Side note - anything I can do to get him to ask for my number