I've just talked/I just talked to Pete.

[Topstudent]

A: Guys. I('ve) just talked to Pete. It's not good. Sharon('s) filed for divorce. A week ago.

B: What? You kidding me? Why would she do that?

A: She('s) found another guy. Apparently Pete('s) already moved out.

In this dialog, that I wrote, would you use the present perfect or simple past for the four bold-face parts? What would be natural to you, 'cause I have no idea.

 

[emsr2d2]

I'd use:

A) I've just talked to Pete. Sharon filed for divorce a week ago. (Note that I would make the part starting "Sharon" a single sentence, not two.)
B) As written, although of course "Are you kidding me?" would be grammatically correct in non-casual speech.
A: She's found someone else. Apparently, Pete's already moved out.

 

[Tarheel]

I'd say it a little differently.

A. I just talked to Pete. Sharon filed for divorce a week ago.
B. What? Are you kidding me? Why?
C. She found somebody else. Apparently, Pete's already moved out.

As likely as not the individual would say "he's already moved out" and it would be understood who that referred to. (They're talking about Pete, of course.)

 

[Rover_KE]

Topstudent, please note that I've changed your thread title.

Titles should contain a word or words that you're asking about.