Im such a clown

I remember back when I was new to bl, I watched Sekaiichi Hatsukoi and there was like 3 stories on it right? I thought all of the mc is Onodera. There was this one scene where the 2nd couple ml said to the 2nd mc that he should be the only one he like. And Im too confused because doesn't Onodera like Takano? I start having suspicion but I paid it no mind. Im bad with remembering names too so i didnt even notice the name differences.

And it went for 2 seasons, I finished the entire anime confusedly whats happening and who likes who.
Then I realized they are different couples and people and has to watch the entire 2 seasons again.