'There are other fish in the sea.'
That being so, it also implied there were many fish in the sea.
If so, Sasuke had to wonder...why were all these girls swarming around him? A whole 'school' of them. What was so special about Sasuke Uchiha? Of course, besides the fact that he was an Uchiha - one of the last two remaining - and his good looks. He didn't consider himself vain, he just had a very high self-esteem, and according to others, a very large ego.
Of course, on another note, he didn't understand what had reeled him closer to her. (Pun not intended) If it were true what they said about the many fish in the sea, it must be a pretty small sea (which made no sense, seeing as if it were a small sea, it wouldn't be called a sea, but a pond...or something like that).
Maybe that was it...maybe it isn't a sea they were swimming in, but a small lake or pond. That would explain the amount of other fish attracted to him. There weren't many other fish to choose from in a small pond. It would also explain how he had found her. Her 'uniqueness' would definitely be something to notice in a small pond. Who else had pink hair or such captivating green eyes? Along with the large forehead, which really wasn't that large in the first place.
This thought made the young avenger ponder the importance of his existence. The importance of their little pond compared to the whole sea of fish.
Thinking more on the subject...who compared humans to fish anyways? Fish were so weak-sounding. Something you cut the heads off of and ate in a sushi roll. Sasuke decided he was definitely not a fish. Maybe he was a fisherman. They were the ones that caught the scaly, aquatic creatures after all.
He had asked her once about it. He told her about the sea and pond theory, along with playing the part of fisherman. She simply brushed a few stray hairs behind her ear and said something that had surprised him.
"Well, Sasuke-kun, of all the fish in the sea...I'm glad you were the fisherman to catch me."
He looked at her, surprised at her words, and soon dropped the subject...
...because it just didn't seem to matter as much anymore.