I broke up with my ex about 3 months ago. After I broke up with him, he instantly texted my bff and and started flirting with her and ask her if they could have sex together. She refused. And now he is flirting with my other close friend. He cheated on me several times when we were together and now, even after our breakup, he doesn't let me to have a normal life. Everytime he shows up, flirting with one of my friends. This behavior destroys my self-steem and ambition. Why he doesn't flirt with his own friends, people that are strangers for me?