This guy coworker has become a little friendly/too nice toward me and I’m not saying anything wrong with that but how do I nicely handle this?

Just that he is taken and I have no desire to even be friends with anyone who is in a relationship so him coming off this way is turning me more away from him, like if I try to avoid him as in not even crossing paths he still finds a way to approach me and say hi and little chat

This guy coworker has become a little friendly/too nice toward me and I’m not saying anything wrong with that but how do I nicely handle this?
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