Should I be doing this?

I recently got a job. And to make a long story short, I totally fell for a guy I work with... My manager. He flirts with me a little bit and he's just so cute. I love everything about him. I've known him and worked with him for almost two months now. We were talking at work today and he told me his birthday is tomorrow and that he has to work. I told him I felt bad for him and I was sorry. Well, jokingly he asked if I would bring him a cup cake and I said yes(; so he's like oh,, really!!?! . I couldn't find any cupcakes anywhere so I bought him a tiny little cake. Is it weird that I'm doing this? I don't know how I feel about it. But I do really like him and want to make him smile