Does Villanelle Kill Konstantin?

After Villanelle escapes from prison, she meets Anton who is taking over from Konstantin as her new handler. He has a postcard labeled Moscow and a suitcase of clothes for her. She has until tomorrow night to complete the job and meet him back there. He gives her a gun and Villanelle shoots him in the head.

Who killed Konstantin in killing Eve?

“Don't say loved,” Carolyn advises. She mentions she did care about him but this was inevitable, as she presses the barrel of the gun to his forehead. Konstantin begs Villanelle to do something. Instead of killing Konstantin, though, Carolyn turns her gun on Paul, shooting him through the head.

Did Konstantin betray Villanelle?

Konstantin survived his gunshot wound and was protected by Carolyn in her home so he could help MI6 out the Twelve. However, after learning that the Twelve ordered for Villanelle's death, he betrayed her and Eve to save her and go solo as contract killers.