Same here. I've kept telling myself, "She's doesn't mean anything by it. She doesn't mean anything by it. She doesn't mean anything by it.", until finally the flirting and signals become so goddamn flagrant that I'm like, "OK, she must be wanting something more. There's no way I could misinterpret this." Then, I make a move and "BAM!" Smackdown. Even if it's in a nice way, it's still a smackdown. It's like someone smiling and holding out a box full of your favorite pizza so you can take a slice, and then slapping your hand down when you reach for it and yelling, "What the hell were you thinking, trying to take my pizza like that!?".
The only difference is the kind of pie involved.