While I think the implication that bisexual boyfriends will always cheat on you is dumb, I think it's equally dumb when people want a bi boyfriend just BECAUSE he's bi. And I think/hope the secret-maker is just hating on people who say things like, "I wish I had a bi boyfriend so that he can make out with guys for me!", and not anyone who just happens to fall in love with a bi guy.
Not the secret-maker, but...