Perhaps you're suspecting that your coworker might be into something more than just work. Maybe he has been paying more attention to you for some time now. Cool down, such things happen, and sometimes it's normal for people working together to develop romantic feelings towards each other. But remember, when you meet 'the one' at work, it's essential to figure out the meaning of his behavior. It's vital to learn how to tell if a coworker likes you or is just acting nice.