Flirting or overly nice...

There is this guy at work that i think is flirting with me...but then again i think he's jus being overly nice. Dave seems to think that he's flirting and i need to flirt back but im not a flirt. and plus this boy kinds scares me...i find myself avoiding he's eyes... cuz im scared to find something there...Dont get me wrong the dude is cute...he's nice, polite...sometimes too polite...and manerable. I jus dont wanna think too far into something and end up looking stupid in the end. I woke up with this shit on my mind i went to sleep seeing him in my kitchen in his boxers cooking.. what type of shit is that? My question is God is what am i spose to take from this experience. I dont think im stable enough to deal with this...Cora says relax i say im fine i jus feel lame and wack and she says thats what i mean by relax. I feel wack and lame because i cant tell if he's flirting and because i dont know how to flirt or if i even should flirt back. im a spazz..and idk what to do or what to say or how to feel or respond to him....im jus a big ole mess.