Present perfect: i dumped my girl

[me]

i've not understood some uses of the present perfect:
what kind of difference there are between:
the court has appointed me your public defender
and
i dumped my girl
i broke up with her

isnt the first one i said an action that happened in the past?
please answer me

me

[Yankee]

Is "me" the same person as "mr brown" ?
http://www.english-test.net/forum/ftopic8427.html#21375

If so, do you need addional explanations?

Amy
_________________
"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln

[Alan]

Hi Mr Brown alias me,

I'm sure you don't want any more explanation than the very adequate one Amy has already given you. Let me put some questions to you:

Have you understood the explantion that Amy gave you?

Did you understand the explanation that Amy has given you?

Do you understand the uses I have made of the two tenses - Past Simple Present Perfect Simple ?

Alan
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English as a Second Language
You can read my ESL story Present Simple