It also deserves mention that the emotions behind the crying don't have to be fake for a women to choose (perhaps without even really thinking about it) to exploit the crying to her advantage; it doesn't make her a bad person, just a human being who took the easy road in a moment of weakness.
Finally, feelings of being manipulated are not the only thing a man feels in these situations (he wouldn't continue to feel like a bastard otherwise), its just one of several automatic reactions he deals with simultaneously; the consideration he gives this emotional response depends on the context, how well he knows the girl, and his previous experience with women (just because we dislike emotional complexity doesn't mean we never experience it, dammit!).
...and this is one of several reasons men don't like to talk about their feelings...especially with F women.
I think I'll go back to watching horror movies while intoxicated, now...