What to do about a Crazy Boyfriend?

Well we met at taco bell... Hes 3 years older than me... our first couple of dates were almost perfect... until one day we were juss hangin out and he gets mad out of no where for no reason at all... i tried to ignore it thee first 2 or 3 times, thinkin maybe he was juss havin a bad day... but then he accused me of having a crush on one of his friends... he come up with some weird scenario in his head... i ended up forgiving him for that time, he promised it would never happen again... Until it happend again... this time he actually scared me... i dont know whats wrong with him or what goes through his mind when this happens... well anyways this time he saw me n his friend walkin together... well not together, just out the same door... and he walks off like a mad man n goes to his car puts his bag in the penger seat and SLAMs the door... then goes off n smokes 2 ciggs back 2 back... as i slowly walk up 2 him, i hear him talkin to himself, saying, " I know what the f... was goin on..." and then i start cryin... then he walks past me goes to his car n was like what should i be thinking right now... i said i dont know... then he was like whats wrong i didnt do anything, please explain to me why you were crying... i was like so yur telling me you dont remember what you juss did... and he paused for a min. then said i didnt do anything... but if i did i didnt mean to...... then later when he dropped me off i told him i needed a night to think about "us"...after that he kinda wouldent let me get out tha car... and then out of no where he was like im not the type to keep coming by you house and to text you when you dont want me to... (creepy)... but yeah i dont know whats wrong with him... if he does have a problem someone shoulda let me in, instead of leaving me in the dark... His friends tell me he used to be a bully in high school... n they told me how one time he got mad for no reason n threw his body around and started punchin concrete... i dont kno if its just a jelousy issue but do i really need that in my life.... i went through to much of that growin up, with different men in my moms life... i really dont need that in my life... id like to think that it was all just a dream but the look in his eyes made me think like wow what did i get myself into... what am i ganna do.... too confused...anyone have any advise for me... {n sorry i wrote such a long story...}