I would speak with your coworker about your concerns first to make sure his actions are making her uncomfortable in the workplace before taking it further. If she in fact feels she's being harassed in anyway I would suggest she formally files a complaint and I would serve as a witness if in fact I witnesses anything at all. What you don't want is to take these accusations to HR and both she and he deny anything of the sort has happened and it blows up back in your face. That said, harassment of any kind at the workplace is to be taken seriously with zero tolerance.

I would mention It To. My. One site supervisor. If nothing comes. Of. It then. Go to. Hr make. Sure that. You keep a running notes of who. You. Spoke to. And. What. If. Anything. Was. Done. TELL NO ONE. DO IT. AT. HOME.

I don’t know... if one of them is a “higher up”, I certainly don’t know if I would risk any retaliation if you were going to tell unless this relationship was impacting you directly.

I don’t think it’s his business if his coworkers have a problem with it let them go to hr, is he they mouthpiece? They can’t speak for themselves? Clearly they like it! Imagine he goes to HR complains about the coworker then they ask the “VICTIMS” and they say it’s not true how does he look? Like an all out troublemaker, causing problems on the job, frowned on by all his coworkers. Nah, sit back and wait for the fireworks!! U might think u doing good but u will get the shitty end of the stick! Leave it alone

Someone once told me "dont shit where you eat" & it was some of the best advice. Ive also heard " ,the shit rises to the top" - so true on many levels. I would discreetly find out 1sr if the female coworker Feels Harrassed be4 reporting anything. If she does, you can share with HR if she agrees to accompany you or verbalizes that wants u to address the situation. After all , it IS Her safety & comfort zone in question. So , although he may indeed be a predator, she has to be willing to come forward- with your Offered support. It is Her decision , just like Her body &What She Does or Doesnt Do is Her Business alone, unless she verbally welcomes assistance from you.

Yes tell human resource department manager immediately since you felt uncomfortable and irritated.

Work and relationships dont mix...just my opinion.

so I'm just curious, how does he try to keep her away from other male employees, especially if she has to interact with them? this guy sounds like he has some serious issues.. I would steer clear of it unless you know that the female involved is really being bothered by this man. he's on his way to the top (so to speak) and maybe she thinks he can further her career by hanging with him. I have found that people do some stupid, way out there mess while on the job. if they put half that energy into really doing the work ..lol..i would seriously not get involved - I'm thinking others are able to see this man and what he's doing, his boss needs to pull him aside and have a serious chat.

I do no agree with the "mind your own business" comments. Do what you feel is right.

Read laws on Sexual Harassment, Harassment, and Abuse. Kind of be a blind ear, watch your steps. Be there only when she need you as a witness. Tables could turn drastically if you bring attention from your aspect of it. HR can ask her if this is so? She can say no. Then where are you? Sometimes women can bring another guy that likes her to blows when in fact you may later find out that she may have done something that invited his behavior. Like secretly engaged in relations. Now, you are showing interest so she complain to you and any other guys interested. Be very careful! Make your focus more on self. Surveillance picks up a lot.