I have been working for more than 3 years now with my co-worker and people have been teasing us here and there and it doesn't make me happy, at all. Things have gone awkward to the point where I can't even do certain things just because people might think we're a thing. Back when we weren't being teased we had good rapport but now I actively ignore my co-worker at times, which I feel bad for.
How do I control/prevent this behavior?