The Finale? Poor Holly
Holly was about to move in with Spence since she didn't have a place to live. Danny was gonna move in with the girl he met there that he had a crush on, so the 4 of them all could have had a place to live, but then Danny decided to stay room mates with Spence. However, that leaves poor Holly homeless and on the streets.
Sure, she's a complete idiot when it comes to picking boyfriends and can't see obvious signs of guys that will treat her bad, and rejects guys that would treat her good, but other than that, she's actually a really good person. She didn't deserve to be left on the street homeless and pregnant.
And even if Danny and Spence would miss each other, they can still visit each other even if they lived with different people. They could still make plans to hang out with each other.
"Age ain't nothin' but a number" -- Aaliyah