You could say that a guy has a case of the bromance when he develops a crush on a friend that is a girl.
You could also say that a girl is plagued by bromance when all her guy friends tend to fall in love with her.
Jess: I thinks he's got the bromance.
Emilie: Ew sick dude, we're just friends.
Jess: I bet thats not what he thinks.....