Are you ****ing kidding me? Are you trying to sound like a hardass or something? Because even though girls are a lot more sensitive than guys, I don't believe you would be merely "amused" that a girl dumped you. Then again I am assuming that you at least liked the girl somewhat in the first place. And if you didn't, you were probably just playing her.
@C1,
Don't try to be nice. Even if you are nice by nature. Like somebody else said, girls like being the "soft" ones. You should not be the shoulder for her to cry on if you are not her boyfriend, because you apparently wanted to get into a relationship with this girl.
I know some "nice guys" at school, and they never have any luck with the ladies. They just care about the girls feelings too much, and maybe come across as being pussies. Idk how girls perceive them, but they obviously don't view these guys as "relationship material".
My observations would lead me to believe that they simply like these guys in a different way. Specifically, they view these guys as being cute little things to be adored, and provide them with good feelings, but nothing to take home.
The only advice I can give you is to stop being so nice and caring for others. It's not like these other people give two shits about you. This doesn't mean become an asshole. You just need to become less vulnerable emotionally.