Need bf help

I'm new to this relationship we been together for like a month and I noticed he acts possessive over me every time I have to do a class project and get paired with a guy he gets mad and says he just want to kill him and me and the other guy don't even flirt we just stay focused on our work after we left class he grabbed me by my arm and said I was his and his only so what do I need to do to show him I will never do anything to hurt him I'm always there for him