Tichina Arnold, aka Pam on"Martin," hit the nuclear button on her 3-year marriage by exposing what she says is her husband's sex tape with another woman.
Sources very close to Tichina tell us she put Rico Hines on blast with a scathing group text to friends and family, saying ... "It's over between Rico and I. This is where I part ways and all bets are off." That's the tame part.
The bombshell? She claims he's been banging scores of women -- sometimes without protection -- and she has a sex tape to prove it.