I would say 9 times out of 10 it is most likely that they'll do it again, and even if they didn't you shouldn't stay with them to give them the chance to do it again!
My ex boyfriend used to get really, really frustrated and lashed out slamming doors, punching walls and one time I got in the way and got slammed in a door by him. I stayed with him, and although he didn't ever physically hurt me again in that way, he became very manipulative and cruel- and I found the emotional abuse almost as unbearable and the physical. I realised that other people didn't get treat that way and found someone that showed me that wasn't normal at all.
It's easy enough for everyone to say you shouldn't stay with them when you're not in that situation- but if you find yourself in the situation and you're emotionally invested you may find you're more likely to make up excuses for them as you won't see it as clearly.
Has anyone watched the "Murdered by my boyfriend" programme on Iplayer? It was heartbreaking to watch!
Which unis have sent theirs?