So basically, I joined the Brotherhood of steel and ended up destroying the institute. Everything was fine after the ending except Preston Garvey. He was pissed at me for not letting the civilians escape the blast. When i went to talk to him, he said something along the lines of, “The institutes gone, im glad about that" then he scolds me for killing innocents. At the end of the conversation, he says that they need to forget it happened. If i try to talk to him again he just repeats the conversation over and over again.
After doing some missions for him i went back and he said “good work" and things like that but if i trigger conversation after that he repeats the same line as before. Any help please?