Boy issues... Part 2?

There's this guy at work... He's gorgeous, and his personality makes him 10x cuter. He's tall, dark hair, and just aahhhh. Anyways, Idk if he's dating anyone, but he flirts with me like there's no tomorrow. He like grabs my hand, throws me around (playfully) and idk, he's just super flirty. He makes intensely long eye contact with me all the time too, and he looks at me a lot, especially when I'm not looking at him. (I can see it from my periph). He actually makes it hard to focus on my job cause he's so flirty lol. People at work are starting to catch on, though, so I don't think that's good. I don't want to date a co-worker cause it'd suck when we broke up, I just don't really know what to do. How do I find out if he has a GF? It doesn't say anything about his relationship on his FB so that's no help. But I know that for a lot of guys, they just have that natural flirty-ness to them. Maybe that's all it is? But there's gotta be more cause it's constant.