Track narrowing – no one wants to let the other in – (almost) crash – what to do??

Hello! Unfortunately it happens again and again this morning again such a case. 2 laney road, I drive right and get soon a construction site on my side (is indicated by a road sign). The dear colleague on the left side of course also sees this, but does not want to let me drive on the left lane. Shortly before the construction site narrowing I am a good half car length ahead and insists on my right, but he stops and it really only missing 1-2 cm, s he would have touched my rear left bumper with his right fender at the front. Why does that always have to be? Of course I could also slow down (on the right track, just before the construction site) and stop and hope that someone will let me in, but that’s not the rule. it should be a MIT-IN-ANDER and not a MIT-IN-ANDER in road traffic. After this situation, this lunatic also picked up something of poetry, I didn’t think there was any. He really provoked me! I stopped to the right. …he got out and ran towards my car. Since I didn’t want a confrontation with such an idiot I drove off… I noticed his license plate of course. Next corner I stopped and looked if everything was ok with my car. Was luckily. What if he had striped me now and I had a damage? Wouldn’t the situation be clear? Damage with him in front right, with me in the back left – did I go forward? Should I still get him ads because of his behavior? What if I didn’t I would have left again and he would have demolished my car or hit the window (I’ve seen this before in road traffic)…. Sorry, just had to let off my frustration… so no day should start MFG