Is it ok if your friend flirts with your ex without your permission?

My friend (blank) started flirting with my ex with me knowing so. In fact i was the last one to know. I dont mind my friends dating my ex but she started talking shit about me to him. She also agreed with him when he called me a hoe and easy. Also he was the first guy i was willing to put out, but i remembered i want topp]p save ot for my future husband,he was also the guy who hurt me so bad i tried to kill myself again and cry for the first time after 2 years