The singer, 25, and Karrueche, also 26, has been on and off for a while, but she is said to have called it quits for good last week.
READ: CHRIS BROWN 'OBSESSED' WITH KARRUECHE TRAN AND RIHANNA
Chris posted a snap of him in an orange jail jumpsuit, with the caption: "I been through a lot in my life. Made a lot of mistakes along the way. But through it all I've always been true to myself and through God I've been able to take care of my family!
"I should regret some things but I think the lessons learned will shape me into a real man. I'm grateful and appreciative!Thank you for life! (sic)"
READ: KARRUECHE TRAN OPENS UP ABOUT 'BATTLE' WITH RIHANNA
It is believed Karrueche finally put an end to her rocky relationship with Chris after he 'liked' two fan photos of himself and ex Rihanna, 26, on the social networking app.
As well as his relationship with Karrueche, Chris is thought to be referencing his 2008 attack on Rihanna.
Karrueche recently broke down on TV when speaking about being in competition with Rihanna.
READ: KARRUECHE TRAN CONTINUES ANTI-BODYSHAMING CAMPAIGN WITH STRETCH MARK BELFIE
She told Keke Palmer: "I've never dated a celebrity before so it was very new to me, paparazzi and all that.
"And the, even the situation with Rihanna, you know the reason why people tuned into this so much was because it's relatable."