(informal) to wear rose-colored glasses

to fall for it, to be taken in, to be totally hoodwinked

to go through hell

(transitive, informal, figuratively) to be sick of (something/someone), not to be able to stand the sight of (something/someone) anymore

to look on the bright side; to count one's blessings

(figuratively) to see the glass half-empty (to adopt a negative, pessimistic attitude towards a situation, or towards life in general)

(figuratively) to see the glass half-full (to adopt a positive, optimistic attitude towards a situation, or towards life in general)

(idiomatic, colloquial) get lost! (go away)

seeing is believing

(informal) to get lost, go to hell