Is this safe?

The guy I’m seeing/having sex with. We’ve been friends for about 2 years now but just recently started dating. Anyways, we have really rough sex and he chokes me. He told me that he likes it and it turns him on when he sees my face get red. I’m perfectly fine with him doing it but is that normal to get turned on by? By seeing someone else’s face get red? He’s also made comments to me about he’s thought about murdering random people and how he has no empathy sometimes. He told me this when he was angry about a family situation so I thought he was just being dramatic. Anyone who has advice, that would be greatly appreciated.