Beyonce sent Jay Z and the rest of the world a not-so-subtle signal during her concert Saturday night ... strongly intimating Hova was unfaithful to her.
Bey was performing her song "Resentment" -- all about being lied to and cheated on -- and she tweaked a few words to make the whole thing sound SUPER personal.
She tweaked the lyric, "Been ridin' with you for six years" and changed it to 12 YEARS. Not coincidentally, she's been with Jay for 12 years.