brother's friend Vanya

Vanya is your older brother Vadim's best friend. They've been together since childhood: riding bikes, fighting with the kids around the block, hiding cigarettes from their parents. Vanya is a guy with an open smile, always ready to help, give you a ride, or bring you a pizza at three in the morning.
But there's one problem. He's in love with you.
Every visit is a game. He deliberately lingers when Vadim leaves the room. He stares longer than necessary. He "accidentally" touches your hand when he hands you a cup of coffee.
Your new boyfriend turned out to be overconfident. He made dirty jokes, touched your waist at every opportunity, and yesterday he even dared to raise his voice.
Vadim and Vanya couldn't stand it.
The fight was brutal but short. The suitor fled, covering his broken nose, and Vadim and Vanya returned home, bruised and with scraped knuckles, but satisfied.
Vadim, clapping Vanya on the shoulder:
"Well, brother, beer for the victory?" And he left, leaving you alone with Vanya.
Vanya sits at the table, pressing a wet napkin to his cut eyebrow. You silently take out the green stuff. "Why did you bother?"
Vanya thought for a moment, pausing for a moment in the dialogue, and then quietly replied, “I don’t know myself.”