He has messaged me 3 times in linkedin and twice in text. He has looked at my profile 3 times too. He is 32 but married with kids. I'm a claims administrator. And he approached me many times asking how I am.
In that case its sounding more like he is probing to see if you could be a friend he can trust in the office which is good for your career. Your worried he wants to be more then friends, which in my opinion is not necessarily the case, but at the same time he wants to be more the friends so he can bring you home to spice up the marriage ;) Honestly with what you gave me I don't see any reason to feel threatened there are plenty of other reasons that he would be trying to get to know you better and I think being polite and friendly is the best course of action. Maybe he will cross the line, maybe he's perfectly fine. There is no way to know for sure at this point.
I have to apologize for the horrible grammer I reread only half of what I wrote. I'm just saying he's not necessarily cheating if he is interested sexually but there is not enough of substance to draw that conclusion in my opinion
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