He said to me that his "brother doesn't think we should date no more, and we can be friends"
I was like OK then..
Then I left and started crying... Why did he break up with me.. and why would he use his brother as an excuse?

Because his feelings changed and he took the cowards way out, rather than just be honest.

I totally understand why this would be so upsetting, especially if you really like him. He probably used his brother as an excuse so that he wouldn't hurt your feelings even more by just breaking up with you. If you were only dating for that short amount of time, maybe he realized he didn't want a relationship, or that he didn't know you well enough, and it's good that he offered to be friends. I would definitely take that offer if you still like him. Maybe if you get to know him better then you could wind up having a more meaningful and longer relationship :)

Don't be clingy, or show him that you need him. Make him see how great you are, hang out with your friends, laugh a lot, generally be happy :) x He'll probably come running back, and if he doesn't, he's not good enough for you anyway :)