Lilith's graduation prank didn't go over so well with Dirk... I mean, she could have put a little more thought into it beyond that: "it's almost exactly like having a cooler of ice water thrown on your after a game... only colourful!!" Dirk, on the other hand, thinks that a slushy is decidedly stickier and made his opinion of Lilith's prank very clear...
I'm sure Lilith's prank had nothing at all to do with Dirk being the only one of the three to graduate. But either way, that was the end of their relationship. They broke up right after the graduation ceremony.
Meanwhile, Angela was suddenly talking to every guy in the dorm... and considering that she hasn't talked to her boyfriend in 2 years, that may not bode well for their relationship. She's not ready to move in with Dustin, and she's definitely wondering if it's time to leave their high school romance in the past.
See the rotation trackers and family trees for all my Pleasant Hills playthroughs, check out my YouTube channel to catch up on previous streams, or get the save file and play it your way!