does my boyfriend need a doctor or just time to get better?

[beep beep]

Thursday my boyfriend got hit by a car. The car was only going like 5 mph when the truck made too much of a sharp turn and hit him... He said he fell down on his right knee and his arm popped out of his socket but nothing else. he said other than that he felt fine, so he didn't go to the hospital or anything. He popped his arm back into place and he was limping for a couple of hrs cuz of his knee but then he felt completely better. He said his arm has popped out of place twice before that, when he was in football but he also popped it back in and felt better. Well it's been 4 days since he got hit and he said his arm is still in a lot of pain.. I keep telling him to go to the doctor but he says he'll be fine. is it normal for his arm to still be in a lot of pain and be sore? later that thursday he had to go to work and didn't let his arm rest and he has to lift some heavy stuff so i think that may have something to do with it. does he need to just rest? what can he do?