What does たがった mean in this sentence?


In a short story I'm reading, the protagonist is reminiscing about her past,
and she thinks this:

>
> 翌年の四月に、私のすぐ上の兄が呆気なく肺炎で死んだ。その四月に、姉は大学に入った。自分だけ取り残されたくなくて、私は姉が楽しみだしたことを自分にも求めた。つまり、ジャズを聞いたり、映画を見たり、そして異性の大学生や高校生とも知り合いになり
> **たがった**

I kinda get the meaning of the sentence, but I don't really understand the
last part: `異性の大学生や高校生とも知り合いになりたがった`. `異性の大学生や高校生とも知り合いになり` means she made
acquaintance with university and high school students of the opposite sex, but
as far as I know `たがった` is the `たい` form with the auxiliary verb `がる` which
you use when you want to speak of other's emotions, so `たがったり` seems to mean
"(someone else) [seemed] to want".

As far as I understand, and the translation given in the book is on the same
line, the main character is saying that in order to not being left behind she
started doing the new things which interested her sister, so I would think
something like `知り合いになった` would end the sentence.

Is she saying that she started doing things that latest* things that
interested her sister, and the main character **thinks** among those things
her sister wanted to make acquaintance with university and high school
students of the opposite sex?

* "latest" for the `だし` part of `楽しみだし`, which I think is from `出す`, which when used as auxiliary means "To start [something]", so I'm guessing `楽しみだし` means something that just picked people's interest.




In this case, the author is using 〜たがる in relation to both herself and by
extension her sister.

The reason we use 〜がる (and by extension 〜たがる) in regards to other people is
because we can't be 100% sure if that person actually wants to do a given
action. We can only look at them and judge whether they want to or not based
on how they're behaving.

〜がる is used to indicate this judgement.

So I would translate:

1) 彼は行きたいと言っていました。  
2) 彼は行きたがっていました。

as

1) He said he wanted to go.  
2) He was acting like he wanted to go.

In the case of your sentence, the author is looking back at her past self
imitating one of the things (based on her judgement) her sister suddenly
started enjoying doing upon entering college, and presenting an objective
picture of her own behavior.

compare:

つまり、ジャズを聞いたり、映画を見たり、そして異性の大学生や高校生とも知り合いに **なりたがった** 。

to

つまり、ジャズを聞いたり、映画を見たり、そして異性の大学生や高校生とも知り合いに **なりたいふりをした** 。

and

つまり、ジャズを聞いたり、映画を見たり、そして異性の大学生や高校生とも知り合いに **なりたくなった** 。

With なりたいふりをした (to pretend to want to become), the implication is that the
writer (and by extension her sister) didn't actually want to make
acquaintances with those kinds of students.

With なりたくなった, the implication is that the writer saw how her sister was
behaving, and as a result really truly herself began to want to make
acquaintances wlth them.

However, with なりたがった, the implication is while the author may be reminiscing
about her own past, she is not commenting on whether she actually wanted to
make acquaintances or not. She's simply stating that looking objectively at
the actions of her past self (and those of her sister), one would come to the
conclusion that she did want to make acquaintances with them.

So I would translate your example as:

In other words, I listened to jazz, watched movies, and even acted like I
wanted to make acquaintances with college and high school students of the
opposite sex.




In this case, the author is using 〜たがる in relation to both herself and by
extension her sister.

The reason we use 〜がる (and by extension 〜たがる) in regards to other people is
because we can't be 100% sure if that person actually wants to do a given
action. We can only look at them and judge whether they want to or not based
on how they're behaving.

〜がる is used to indicate this judgement.

So I would translate:

1) 彼は行きたいと言っていました。  
2) 彼は行きたがっていました。

as

1) He said he wanted to go.  
2) He was acting like he wanted to go.

In the case of your sentence, the author is looking back at her past self
imitating one of the things (based on her judgement) her sister suddenly
started enjoying doing upon entering college, and presenting an objective
picture of her own behavior.

compare:

つまり、ジャズを聞いたり、映画を見たり、そして異性の大学生や高校生とも知り合いに **なりたがった** 。

to

つまり、ジャズを聞いたり、映画を見たり、そして異性の大学生や高校生とも知り合いに **なりたいふりをした** 。

and

つまり、ジャズを聞いたり、映画を見たり、そして異性の大学生や高校生とも知り合いに **なりたくなった** 。

With なりたいふりをした (to pretend to want to become), the implication is that the
writer (and by extension her sister) didn't actually want to make
acquaintances with those kinds of students.

With なりたくなった, the implication is that the writer saw how her sister was
behaving, and as a result really truly herself began to want to make
acquaintances wlth them.

However, with なりたがった, the implication is while the author may be reminiscing
about her own past, she is not commenting on whether she actually wanted to
make acquaintances or not. She's simply stating that looking objectively at
the actions of her past self (and those of her sister), one would come to the
conclusion that she did want to make acquaintances with them.

So I would translate your example as:

In other words, I listened to jazz, watched movies, and even acted like I
wanted to make acquaintances with college and high school students of the
opposite sex.

