BF Problems

I want my bf to cut his ex from his life because she stabbed him multiple times. She is clearly unstable and has anger issues and wants to get back with him. He continues talking to her because “he cares about her in a friendly way” and tries to make peace with her. Am I wrong for caring about his safety? I’m not being some jealous gf who’s insecure and scared he’s gonna cheat. I’m just pissed that he can’t cut her off even when she’s been abusive towards him and made him get stitches multiple times. Mind you, he once told me he wished I had her sex skills and that I come in 2nd. Also said that if we broke up he would have a one night stand with her. Help ya girl out