When you spend months, years, trying to get a guy to open up, to commit. When he insists it is because he has scars and issues with women in general and that he is trying to be better for you. When he is never what you want and you cry and cry and wonder what you could be doing wrong, but continue to have hope that maybe one day he will realise all your worth and become the prince charming you deserve.
When he does become prince charming. But it is not for you. It is for some other girl he just met.
The Over-Eager Guy is the way that the universe has of slapping you in the face. You complain about guys not paying attention to you? You want a guy who is able to compliment you? You only meet assholes who are not clear about their intentions? Well, here you have, a boy wrapped up in a nice enough package and okay, yes, I'll give you my number because you've asked nicely and you have puppy-dog eyes and seem harmless. Big mistake. Yes, the Over-Eager Guy might seem harmless at the beginning, but the minute you look away he'll start professing his utter devotion for you night and day and asking if you can meet up asap and just bordering on plain psycho.
This is how it goes with As-Long-As-She-Has-Boobs Guy: You meet him one night and you start talking immediately, you think you've clicked and that there might be, for once, something there worth pursuing. You play a little hard to get to keep him interested and so you don't give in to his charms the first night. You fall asleep fantasizing about all the different possibilities, excited because it might finally be something. The next morning, you wake up to find out that after you left he ended up sleeping with your friend. Yes, he had clearly felt a connection too.
Let's toast for the Naive Idiot, who, two years after your brief (and questionable) romance still believes that you are somehow still not over him, when in reality you were over him the day you met him.