Joaco and Santiago

Santiago and I had only been dating for four months. It was the first time she had gone to River Plate's training grounds to pick him up after practice. The entire team already knew who she was: Santiago talked about nothing else. The teasing started immediately.
That day, Joaco Freitas approached before Santiago.
—Hi, I'm Joaquín. Are you the famous girlfriend of the goalkeeper?
"I didn't know she was famous," she smiled.
—Beltrán talks about you so much that we feel like we already know you.
Santi arrived immediately:
—What are you doing, Joaco?
—Knowing your girlfriend. Is there a problem?
—None. But you've already met her, now run.
The group was tempted, but as the days passed, Joaco developed a habit: she always greeted everyone with "at/n" before Santiago. She thought it was a sign of friendliness, but Santi didn't like it at all.
On a Friday before open practice, she waited on the sidelines. Joaquín reappeared.
—Don't you ever get tired of waiting for this one? If you want, I'm more punctual.
"Oh, really?" she played along.
—Yes, and I'm a striker. We score more goals.
They laughed, but Santiago saw the scene from midfield and crossed straight over.
—Did you finish sweet-talking her?
"What? Does it bother you?" Joaco smiled.
—I asked you if you were finished.
The dressing room stared intently.
"Stop it, Beltrán. I'm messing around," Freitas said firmly.
—I don't find it funny. There are thousands of women, and you're just trying to be funny with mine.
—Do you have so little confidence in him?
The atmosphere became extremely tense. Santiago stood chest to chest.
—I have complete trust in her. The one I don't trust is you.
—Well... we're not that close friends, so be careful...
A sharp whistle cut the fight short.
"WHAT ARE YOU DOING?" Gallardo's voice boomed. "There are 48 hours until a Superclásico and you're playing a game to see who's the biggest idiot?"
He looked at Joaquín and then at Santiago:
—Changing room. Both of them. Now.
They obeyed in silence.