Why are boys so stupid?

I had been dating this boy for only 2 weeks. I broke up with him because he was too bossy, too nosey, and not a gentlemen. He constantly was nagging at me all the time. I mean I am a very nice person, good grades, and try to get along with everybody. but he just brought out the worst in me. I mean I broke it off with him because i got the feeling he only wanted me for "one thing" and i was right. I mean i am angry b/c he is like going out with someone else...but.. he keeps on touching me. like trying to hug me sometimes.. like he doesnt understand that i dont like him anymore and tries to flaunt his new girlfriend in my face and stuff... why is he like that? i mean i dont understand why is he such an idiot? did i do something wrong?