Why did the Subway turn on me? O_o (Fallout 4)

Completed the quest "Undercover work", joined the faction, also did "Boston at Night" and the first quest to find a cache, took the next one. But then he decided to run around with Valentine and pump up his relationship, completed his quest. I jump into the underground shelter, and everyone is angry at me. Somehow he interrupted. PEM, first attacked, then fled to her cubbyhole and was not aggressive at the table. Stands, staring at me and twirling his hands. At attempts to talk, he gleams with duty phrases, such as calculating something there. What's wrong?
Yes, and along with Valentine, it was highlighted that the quest for the cache had failed.