Would you keep texting him?

So this guy has a gf and we work together. I DO NOT want anything to do with him like that. He's attractive and everything but he's my coworker and I just don't think of him like that. Anyway, he texts me a lot like even when we're in the same room and not able to talk, he texts me on the weekends and it'll be like, almost all day. But he's never flirting and it's always about tv shows or movies and books. Literally no flirting at all! We just talk a lot and I don't feel bad because I'm not coming onto him and he's not coming onto me. Is this ok?