Most Helpful Girl
If he's just looking not starring then it's harmless. However if he's staring all the time and giving her lingering looks its inappropriate. If your out and you see a guy/girl you think is attractive, your gonna look. Its human nature. But when you do it to the same person all the time. It's wrong
There's a guy at work that did this to me for a long time. He would stare, use lots of eye contact, etc.. When I realized he was married. I started to ignore him and he finally stopped.
He may not have meant anything by it, but to me it was very misleading and not something that a person in a relationship should be doing.