Attend alone, perhaps, 6 letters
Attend dateless, 6 letters
Attend sans date, 6 letters
Attend without a date, 6 letters
Lack a date, 6 letters
Solo, 6 letters
Lose freshness, 7 letters
Become an item, 8 letters
Date exclusively, 8 letters
Date one person exclusively, 8 letters
Don't see other people, perhaps, 8 letters
Greeley's advice to a grumpy teen?, 14 letters
Give up a life of crime, 10 letters
Leave a life of crime, 10 letters
Parole officer's advice, 10 letters
Reform, 10 letters
Crash, 15 letters
Retire in a hurry, 15 letters