The group grew tired of making these sentences because they are lazy.

Who is "they" in this prior sentence?
The group
The policeman finally caught the criminal, because he used pepper spray and handcuffs.

Who is "he" in this prior sentence?
The policeman
Boyfriends always try to go out of their way to treat their girlfriends with respect, but they want to be treated with respect as well.

Who is "they" in this prior sentence?
Boyfriends