Why are coworkers so nosy such as me and this guy always usually talk but today I kinda tried staying away few coworkers was already asking whats Up?

Like what’s wrong with us bc we not talking, they where like you always would joke around with each other now you’re like distant or something so I told the guy coworker and he kept saying I’m not mad at you and started talking I personally try stayin away bc he is married so why should I initiate the conversation with him am I wrong or should I stay cool with him? And why does it concern the coworkers

Why are coworkers so nosy such as me and this guy always usually talk but today I kinda tried staying away few coworkers was already asking whats Up?
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