Is my wife attracted to her coworker?

[Jack]

She sings and dances at a theater. She has already mentioned that she has found this guy physically attractive, and I know the fact that he sings and dances and I don't is against me. Whenever she mentions his name, she always says the first and last name (granted that they are both one syllable, and there is someone else who occasionally shows up with the same name). Also, I'm 5'8, she's 5'9.5, and he's like 6'. We are all in our early 20s

I don't think my wife would cheat. But I know people arent perfect. She briefly mentioned him (we are honest with each other) and then said he wasn't an issue. But the mentioning of the last name every time is concerning, and she is always eager to see what it is he posts on facebook for their group.

I just want to know if I should be wary and or if this is just normal.