NTA I know everybody else is voting opposite. But I truly think that he went across the line on this. Anything questionable should be brought to you first to verify that you approve of it first. You’re still her parent she’s still under 18 and not considered an adult. I think that’s why I know a lot of kids are screwed up. Parents aren’t monitoring their kids they just let them do what they want because it’s easier. To be a parent sometimes you have to go against the grain of what the kid wants or thinks. You have to have boundaries and your bf crossed it. But it doesn’t surprise me, bf has no clue about parental responsibility. NTA