I think I'm falling for my boss?

I just started my new job, it's taking care of dogs in a doggie daycare. It's a super laid back job and everyone is really nice. Its like a huge family. When I came in for my interview I met D (my manager) and a couple of people who worked there. I was instantly attractived to him. lol he seemed to kinda flirt with me but it seemed like his personality. I've thought about him all week, and today we worked together all day and it was an amazing day. Now my question is I want to try and build a better friendship with him, I know he has a Facebook is it weird if I add him? also he texted me to send me his number and he just said his name. Should I reply? HELP.
I think I'm falling for my boss?
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