Yes. It might be... perhaps a sad thing to say, but you won't always stay with the same team. With graduation, and different opportunities coming up for everyone... You can't force yourself to follow a dream that matches someone else's.

[granted, he doesn't exactly know the relationship between momoi and aomine perfectly, but he's been there.]

[afraid that he sounds selfish and unempathetic, he clarifies,]

My best friend, I've known him since I was a baby. We've always been neighbours [until holly heights, but] and we've always done things together like brothers. He's an extremely talented swimmer, and... while I'm not like him, I also swim. It was easy during school, but with graduation around the corner--I had to make a choice. As much as I want to swim with him, because it's meaningless without him, realistically I couldn't keep comparing myself to him nor think I could follow to have a similar dream in competitive swimming.

[...nervously frets with his hands, looking down, then up, then to the side.]

We have to think about ourselves first. It doesn't mean we're not going to be friends anymore, but there are strengths you can use to achieve real goals that will make you happy.