4. Various breakup lingo.
You Think: By being polite, you're sparing the guy the indignity of being dumped.
He Thinks: You're still interested. When you break off a relationship with a guy, be clear about your intentions; don't say anything about "taking a break for a while" or "taking some time to rethink things." This is just leading the guy on, and he'll think that he still has a shot—and men are nothing if not tenacious. Don't give him the wrong impression by accident. It's better to get dumped than to be mislead, even if it's unintentional. 

5. Flirting touches.
You Think: You're flirting by making excuses to touch him, wiping some lint off of his shirt or touching his shoulder when he says something mildly amusing.
He Thinks: You're flirting, but he's unlikely to notice the touches unless you stick with it. Once again, I've got to point out that guys are less sensitive to subtlety than rocks—the first few flirting attempts go right over our heads. Keep at it, though, and he'll figure out what you're getting at.

Have you noticed a guy completely missing what you believe to be an obvious signal? Post in the comments.

Written by Phil Dotree for The Frisky.