My ex boyfriend coworker stalking me, should I be worried?

Anonymous
My ex boyfriend has this coworker who I don’t know how close they are. I wouldn’t really say stalking but His coworker found my number from the internet and my social media page which I don't know how. I asked my ex boyfriend and he said he only mentioned me to his coworkers once when we first dated and it was nothing serious. My ex called me one day after I told him how his coworker texted me and told me how at work this coworker is suddenly weird acting and the vibe is just off when he’s around. My ex even asked was there something between us cause of how shady he was acting.
My ex boyfriend coworker stalking me, should I be worried?
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