My cousin who assaulted me threatened my bf..

Ok so i made a post about how my cousin assaulted me..i updated it and he's not allowed near me but he still is allowed at my house..

So i left my phone on a table and he was over..he unlocked my phone and went through my contacts and texted my bf..he threatened to kill him..

When i came back i saw the messages and i confronted him..he smacked me and told me that i was his..my mom came running downstairs and she kicked him out of the house..

I texted my bf and he was pretty shaken up..

I'm just so annoyed and i want him ti leave me the hell alone..hes already taken so much away from me..

Any advice..?