Is my boyfriend emotionally cheating with this girl he’s fixated on?

How would you define emotional cheating and does it always have to be physical to be bad? Obviously guys look at other girls, but if he keeps looking at the same girl in a charged electric kind of way for over a year, always seemed to stay close to her and spends a lot of time messaging her…is it ok or not? Before he seemed to try to control it and distance himself, but the past month he’s been leaning into it more., when he talks to the girl he seems to know things she hasn’t told him so only way would be if he’s read her conversations with friends on social media. He has a girlfriend, what gives..

Is my boyfriend emotionally cheating with this girl he’s fixated on?
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