Why does she get annoyed anytime I mention a guy (long)?

I think maybe she is attracted to you, but it makes her un-comfortable to admit she likes you, she might be getting jealous and trying to sabotage your relationships with any of the other male trainers, and then being confused by her own behavior (that would explain the hot and cold behavior) the OTHER option is, she is attracted to you, is aware she is attracted to you, and is trying to keep you single so she can make a move. You being straight might piss her off if she is ahving issues with her own sexuality. I dunno to be honest, if she's making you un comfortable then i suggest training with someone else, or changing gyms if your new trainers act the way the guy did when you trained with him...