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
Jayesh	-	Indian, Hindi, Marathi, Gujarati
Felix	FE-liks (German, Swedish), FAY-liks (Dutch), FEE-liks (English)	German, Dutch, Swedish, Norwegian, Danish, English, Romanian, Ancient Roman, Biblical, Biblical Lati
Phaidra	-	Greek Mythology
Aiko	ah-ee-ko	Japanese
Sanford	['sænfəd]
Akantha	-	Greek Mythology