Is your state a No=Fault state with insurance? What is your deductible? Chances are if the bumper is just crooked, they can fix that and the cost won't be as high as your deductible, BUT if they can''t fix it you'll need a new bumper and that's expensive! You really should have gotten the other person's insurance info cause it WAS their fault. Anytime someone hits you in the rear end, it's THEIR fault (generally). And you should have gotten a police report if it was on public roads cause the insurance company will ask for it.
But, if this is an old car and you're not going to get it fixed, I guess I wouldn't worry about it EXCEPT it would bother me that the idiot that hit me wouldn't get a ticket!!
Seems like your boyfriend was a bit hyper about this since it was YOUR car, and you didn't seem to mind too much. As long as you know what you SHOULD do in case of an accident but you didn't think it was worth it, then I don't see what his problem was. It's YOUR car, and it's not costing HIM anything. He sure let his blood pressure go sky high!!! He shouldn't have berated you and called you names -- that's NEVER okay!!! I dont' care WHAT the issue is. He was wrong for that. Hugs, Lee