Dude, Maul was planning on killing Satine before Obi-Wan even opened his mouth. That was his revenge.
No, he never said such thing and it's not showing he would kill her so soon if he wasn't enraged.
Think about it, Maul hates Obi Wan right? If someone was keep taunting him when he captured Obi Wan in the end of season 4 and he killed Obi Wan and the taunting guy, can we say "He's going to kill Obi Wan anyway, it does not matter."