My boyfriend once told me that he knew I had my period because I smiled more than usual.
Dear Angry Face,
This...is preposterous. I am simultaneously impressed and dumbfounded by your boyfriend. On one hand, he is obviously smarter than I give the average man credit for. To observe your behaviors enough to not only notice changes but to keep track of them long enough to formulate theories? Is pretty good. Well done.
Women are perfectly aware that our periods cause changes in our mood, behaviors, etc. They aren't necessarily things we're proud of, but we know ourselves. I know that I am a tad more emotional while I'm PMSing, for example. Does that mean I want my boyfriend to say, "Jesus, it's just a Pixar movie, chill out. Guess we should pick up tampons while we're out,"? Big. Fat. No. In fact, that would probably cause me to head off on an infamous crying rant. (This maneuver, while technically difficult, has zero fans. Not that it bothers me.)
This illustrates a point I was discussing recently with my partner-in-crime: some people do not know the line regarding What to Say Out Loud. Ask my father all about this. His classic moves include but are not limited to"Oh, I've heard all about you!" to boys who DID NOT NEED TO KNOW THAT THANKS DAD and "Well, that's a lot of eyeliner..."
My friends' boyfriends seem to suffer from a great deal of this inner/outer monologue confusion. I've heard many stories like yours, Angry Emoticon, from my girls. You're not crazy for making an angry face for this.
But don't worry. I'm sure if you were, your boyfriend (ex? current? I'm guessing the former?) would inform you of as much.
PS: I'm glad to see that you're not suffering from your period at the moment.