I don't know if this fandom is still active or anyone will read this but recently I remembered the game, got to replay it, read it up to The Perfect Day quest transcript and I have to ask who did you pair up with who?
In my game MC dates Wes, Autumn dated Julian for a while then both broke up and I paired Julian with Payton then Kallie. I love MC and Wes their relationship it is brought up in the main quests. At first I thought Was is better off with Autumn, but honestly first time I played I paired Autumn x Wes as a couple and their relationship was barely mentioned in any quest and now I love my MC with Wes.
Here are my own couples: Wes x MC (Dylan a nerd boy), Nishan x Sakura, Mia x Katherine, Julian x Kallie, Payton x Ezra, Autumn x an artist guy and Koh x a writer girl who is a sister of MC. Koh is also a character I would like to pair with both MC or Wes but I won't break them up for that.
From the All-Stars I have: Calvin x Ryan an obvious couple and Logan x Dizzy. In my first playtrough when I only had three All-Stars I got Beckett I paired MC with him, then I got Logan I paired him with MC too. After I finally I had Ace he was MC's last partner until I gave up on the game at level 30. Ace's fantasy photo booth date Making it work was great and lost forever.