18-20 = "He's hot"
Then the hot guy screws them over, so the got to:
20-21 = "He's fun"
Then the fun guy gets drunk and screws their best friend. So:
21-22 = "He's a good guy"
Then they realize the good guy doesn't have any income potential, and will be a drag on them for the rest of their lives... So:
23-30 = "He's got a lot going for him"
Which means: "He can either support me or at least not drag me down with him while I go to create a future for myself."
HTH