Family Ties - Season 6 Episode 23 : Quittin' Time 1989

While Andy is inspired by his parents' old love letters to try his hand at writing one to a kindergarten sweetheart, Lauren finds herself less and less able to spend time with Alex. She is struggling with her psychology thesis and is becoming increasingly depressed by her lack of significant progress. She confesses to the Keatons that she sometimes has the urge to quit, but Steven and Elyse encourage her to hang in there and keep working on it, much to Alex's chagrin. The day after she has broken yet another date with Alex to work on her thesis, Lauren complains to him that the project which once thrilled her has become incredibly boring. Having received a lukewarm response from her professor on what she has accomplished so far, Lauren finds the temptation to quit and spend more time with Alex too strong to resist. Alex happily assures her that she is making the right decision.