Nah I don't think they rlly knew each other, Takami was suprised she wanted to go pro since he only saw her as a quiet girl before. When Ayame was talking shit I saw it as Takami taking offense over her saying there are talented ppl everywhere and they rlly aren't that special. Maybe it felt like a reality check, esp since he's popular and talented rn in high school, but it's not gonna be that way forever, big fish in small pond type shit. So he didn't appreciate it because it felt like an indirect attack on him, not necessarily because it was directed towards Koyama specifically. Plus from their phone call shortly before they broke up he seemed kinda unsure of what to pursue after high school, maybe he's not sure if music can really get him anywhere and Ayame added to that insecurity