Leaving out rejection, this is the most common male experience by far. Really puts the lie to the “MEN ONLY WANT SEX!!!!!!!!!!!!!!!!!!!!!!11111” crack-smoking narrative, doesn’t it?
I can think of a dozen times I didn’t realize until days, months, and sometimes years later when some girl was flirting with me and I did not pick up on it or didn’t want to assume incorrectly.
If I (or most men) actually cared about sex only, those opportunities would never be missed.