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
Chaya	-	Hebrew
Perry	PER-ee	English
Eric	['erik]
Abdullo	-	Tajik
Gottlob	-	German
Xanthe	-	Greek Mythology, Ancient Greek