I'm worried if I block him I'll come home to my apartment broken into

His grandma is an attorney and I'm worried he will convince her that our baby cats are his only. I didn't text him all day yesterday but today I did with the screenshot below. Could've been better, but I've been trying to end this for 2 years. I am angry at myself for sticking around and being sucked in and feeling bad. Every time we would argue or I'd try to break up with him he'd threaten to kill himself or shoot himself or several times could cut his arm. I still remember laying on the bed and feeling his blood hit my face and driving him to the emergency room and lying saying it was on accident cause he wanted me to say this. Then on YouTube he started live streaming and this was his title. I almost texted back saying I'm sorry and this is the best for us, but it feels like an addiction I'm saying no to. I'm worried he will break into the apartment and take the girls or convince his grandma of something