My [28F] boyfriend [27M] of three years refused to pull over while he was driving, pissed himself, and then kinda blamed me for it.

My boyfriend and I have been dating for three years. We were driving in the back roads for an hour and near the beginning of our journey he said he needed to piss. I asked him at least four or five times if he wanted to pull over, since he was driving, and he refused. When we were almost home, with a gas station in sight, he said he couldn't make it any longer and pissed his pants.

It was a very awkward ride home the rest of the way (10 minutes). I didn't mention it and helped him clean it up while he showered and put on some fresh shorts.

He then tried to leave my house to return to his own house after he got out. I asked why and he said that it was because of him peeing himself and it happened because I was mad at him over something he had said before we left from our destination (what he said wasn't relevant to the. Previous to us getting into the car, I had told him I didn't want to talk about the issue for an hour, and just wanted to cool down a bit before we discussed it, as I need some time to process things. I wasn't overly chatty during the car ride home, but I wasn't giving him the cold shoulder or anything. He said he just wanted to get home to discuss it (totally against his character, he is completely against confrontation), and that he didn't want to pull over so he could get out of the car quicker. I didn't really understand his explanation, but I haven't pushed.

Reddit, I've had a hard time dealing with this. On one hand, I know that bodily functions sometimes cannot be controlled, but he was in full control of the car and himself and refused to pull over. Then he kinda shifted the blame to me. I've had a hard time looking at him the same way. I mean he is a grown man, why is he pissing himself? I feel terrible for feeling this way, but he never acted embarrassed or anything, just kinda got defensive. I asked him if this has ever happened before, and he insisted that it hasn't.

Am I overreacting to what happened? I feel like I might be.

tl;dr: Boyfriend was driving and needed to pee. He refused to pull over and pissed his pants. Blamed me because I was upset over something he had said on why he did it.