So my bf has so really bad anger issues and often gets black out mad over the smallest things. He has never hurt me or threatened to but his sister has told me about some of the things that happens when he gets mad at home. I haven’t seen him angry but one time and that was at one of my friends because he was jealous. We were at a school function and he got mad and left the building. I waited a while before going to check on him because I knew he was pissed. When I did go find him he was sitting up against the wall with dirt on his knuckles and I asked him what he did ( he likes to hit or break things when he is mad) he just told me to leave. He threatened to beat the shit out of my friend later that day

I haven’t ever been scared of him and I trust him completely but my friends say I should be scared. Should I ?

The guy he threatened hasn’t ever touched me or flirted with me btw