In Chapter 16 of The Sun Also Rises, why does Montoya want to protect Romero, and how does he do that? How does Jake react to the invitation from...

Montoya wants to protect Romero because the boy is a
prodigy in bull-fighting. Romero has a bright future, and Montoya does not want him
spoiled by negative outside influences, like fame and women. He
says,

"People
take a boy like that. They don't know what he's worth...Any foreigner can flatter
him...and in one year they're
through."

When the American
ambassador asks to meet with Romero and another bullfighter, Montoya, fearing that the
invitation will be the beginning of unwanted distractions, does not know what to do. He
asks Jake's advice on the matter, and Jake, understanding Montoya's concerns, tells him
to simply not relay the message to Romero.

Later, however,
Jake contradicts his original action when Brett asks him to arrange a date for her with
Romero. Jake complies, knowing that Brett, as an "American woman...that collects
bull-fighters," is exactly the kind of influence that will ruin the young man as Montoya
fears. When Montoya comes by and sees his young
protege

"with
a big glass of cognac in his hand, sitting between (Jake) and a woman with bare
shoulders, at a table full of
drinks,"

he feels rightfully
betrayed, and leaves the room without even nodding at Jake. By setting Romero up with
Brett, Jake has lost the respect of the aficionados, who watch him from the bull-fighter
table with "hard eye(s)" (Chapter 16).