For greetings, is it "Haven't talk to you for a while" or "Haven't talked to you for a while" past tense or not:=?

Answer 1

The correct statement would be
"(I) haven't talked to you for a while"

It is called present perfect tense, although it deals with what did (or did not) not happen earlier, at an unspecfified time.

"I did not talk to you" would be past tense.