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
Tama	-	Maori
Anup	-	Indian, Hindi, Marathi, Bengali, Malayalam
Bryant	BRIE-ənt	English
Gerry	['geri]
Erwan	-	Breton
Bowers	['bauəz]