meaning - "Would have" and "would have no"

Could you describe about "would have ~ed" & "would have not ~ed".

I know would has the several meanings. But when I was talking with one of my friend who is a native speaker and in this following conversation with him I couldn't understand the meanings he said.

A: I bought strong cheese this morning. Let’s eat it! You like it, don’t you? Because You have stayed in Germany for several months and Germany is famous for cheese.

B: Not really. Because when I was living there I tried a strong cheese and felt so bad afterwards. So I wouldn't have purchased any cheese in Germany at that time.

When I heard it, I got it that he has never bought any cheese there.

If so, what’s the differences between "I wouldn’t have bought" and "I have never bought"?

I would like to know the accurate meaning.

Also I found the description like my question online below.

Q:

Hello All,

Could you tell me if I say "He would have done that" what exactly does it mean?

Does it mean that "he just start to do that before something happens and that make him stop to do it.

A:

We need more context, Farheen.

(1) He "would" have done that = he is the sort of person to do such a thing.

(2) He would have done "that" = He would have done something different.

(2) "He" would have done that = He must have been the person who did it.

Can you give us more of the text?

In this Q&A, the answered person answered the question in 3 conditions and I've thought

if would is replaced with would not ,these all sentence will turn into negative condition.

For example in (1) He "would not" have done that = he is “not” the sort of person to do such a thing. Is this also right?

If so can I say the following sentence as one of my customs?

For example:

I wouldn’t have shoplifted in my whole life.

I wouldn’t have had a relationship with a lady, not even once

And I have another question.

what’s the differences (1) &(2)blow?

(1)He would have drunk coffee when he was young. = he is the sort of person to do such a thing.

(2)He would drink coffee when he was young.