set (oneself) up for a letdown

To set one's expectations so high that one will inevitably be disappointed by the outcome. (Sometimes hyphenated as "let-down.") I know you're really excited for this movie to come out, but I think you're setting yourself up for a letdown. John was so convinced that his relationship with Mary was perfect that he set himself up for a let-down in the long run.

Common Names:

Name	Pronounced	Usage
Sequoia	sə-KOI-ə	English (Rare)
Humphries	['hʌmfriz]
Theodoric	thee-AHD-ə-rik (English)	History
Halle (1)	-	Norwegian
Thecla	-	Dutch (Rare), Late Greek (Latinized)
Paride	-	Italian