If u go wit ur friends ex should they get mad even thou they broke up 2 munts b4 we started goin out

You just said it friend's ex. That's a don't mess.

It would be unreasonable for your friend to object but emotions always trump reason on the subject of dating. There aren't any rules. Who you go out with is your choice but whether your friend gets mad is hers/his.

You have to decide whether the ex is hot enough to lose a friend for.