Sasuke heard what happened at his brother's office through Ino. He couldn't believe that it took place because from what he knew, Naruto was never the type to be violent. In fact, he remembered how Naruto reacted when he saw him making out with some ramdom girl from their school. He just looked at them and left as if he never saw them. This made Sasuke envy his Aniki. For Itachi have seen how Naruto can be possessive. Something that he'd hoped to see from Naruto back then.
For the record, he never told Naruto about his true feelings. He was afraid that the blonde would avoid him once he confessed. So in order to put up a fascade, he made it his mission to seduce the only girl he'd heard Naruto had interest in and pursued her to be his girlfriend. Not that he made an effort to win Yugito because the girl is one of his fangirls.
That's when their relationship as bestfriends fell apart. Everytime the blonde would see them together, he avoids them. He thought that Naruto was just jealous because he got Yugito before Naruto was able to make a move on her,
Sasuke would always show off Yugito in front of his friends especially if he knows Naruto is around just to see how the other would react. However, the blonde would either ignore them or leave.
When he learned about Naruto and his brother's relationship, he was confused. He often wonder, since when Naruto like guys? Sasuke even thought that if he knew Naruto was into guys, he would've confessed to him back then. Maybe things are different now. But then, he would also remember that Naruto has an amnesia and he can't really tell if Naruto was gay back then or was it just now.
Speaking about Naruto, he hadn't seen the blonde since their gig. He had convinced himself that it was for the best but damn he missed him so much. He missed how he talks and smiles eventhough Naruto wasn't really talking to him or the smile wasn't directed at him. He wanted to see him but at the same time he don't. Whenever he thinks of Naruto his conscience would scold him and remind him that "he is your Onii-san's fiancè". But he couldn't help but long for Naruto.
His urge to see and be with Naruto sometimes leads to an accident. Like that one time when Ino invited them at Sai's place. He wanted to talk to Naruto alone which he ended locking him up at the dark room. An hour later, they found them at the floor unconcious with a cut on his forehead which made his blonde brother insane.
Another incident was at the Uzumaki's, when he got jealous of some swimming instructor that teaches Deidara how to swim. According to Sui, the swimming partners are Deidara and Naruto's friends. He saw how the instructors talk and touch Naruto which made him jealous.
He confronted Naruto with the excuse of " I don't want my Aniki being fooled" which resulted into a fight. Naruto broke his ankle when he tipped over while chasing after Sasuke.
And the last one was when he pushed Naruto at the pool. They were arguing that time. When he tried to leave, Naruto stopped him by holding his wrist. The blonde was never a fan of any argument and if things turned out to be that way, he'll either kept silent or leave but whenever he'll have exchange of words with Sasuke it always ends in a not so good converstion.
Sasuke on the other hand, couldn't keep his composure whenever he is talking to Naruto especially when he is jealous. That day, when they had a big fight as he accused Naruto of cheating with Deidara's swimming instructors, he pushed the blonde at the pool (they were having a conversation at the swimming pool).
He left Naruto not knowing that he has developed a fear in deep body of water called Thalassophobia. Ironically, Naruto was a swimmer in their school. That's how he got in Konoha High because he got a scholarship being a promising swimmer.

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My Brother's Fiancè
Fanfiction" Listen?!.. that was the only thing I asked from you but you won't listen. I begged for you to listen to me , heck I didn't give a damn if you'll believe me or not I need you to hear me out but you shut me off. " I can't think of a better descript...