So a guy at work has been hitting on me every time I see him. He has a girlfriend, however he keeps saying that if he didn't have this girlfriend he'd be all over me and would date me. However, he continues to flirt with me by constantly touching me, grabbing my butt, and tickling me, not to mention the racy comments he makes. What should I think of this? I like him, but I don't want to be all over him if he has a girlfriend.