Alright Guys...

...Here's the perfect excuse:

What if he (or she) can’t read your emotions?

"If someone you care about can’t read your emotions from the look on your face, their prefrontal cortex might be the reason."

[---]

"Neuropsychology researchers at the Montreal Neurological Institute and Hospital and McGill University have found that certain parts of the brain are critical for either detecting or distinguishing emotions from facial expressions.

What does that mean? It means that if your sweetie forgot to bring you flowers on Valentine’s Day, and the sad look on your face simply didn’t register in his mind, there’s a chance he can’t help it. The problem might be in his prefrontal cortex."

Just tell her it's your prefrontal cortex and don't blame me if she clobbers you. I'm just the messenger.