Show (one's) (true) colors phrase
To show one's real feelings, beliefs, or personality, as opposed to the one that they usually portray themselves.
My husband, who I met online, showed his true colors after we got married.
He had blinded me all these years by not showing his true colors.
After John showed his true colors, no one wanted to play with him anymore.
The verb "show" must be conjugated according to its tense.
This expression alludes to the antonym, false colors, that is, sailing under a flag other than one's own. [Late 1700s]
To say the same thing repeatedly
Ok, I get it! You sound like a broken record, seriously!