Cardi B still has murderous thoughts of her estranged husband Offset ... but her new romance has opened up a new chapter for her soft-girl era!!!
An insomniac Cardi hopped into X Spaces early Tuesday morning to vent to her fans about how much trauma Offset caused her in their last few years and admit had she not left him, she'd be in jail -- for MURDER.

You can hear her fighting through tears .